with non-welded and non-soldered seams

Industry

CPC
B21C37/121

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Parent Industries

BPERFORMING OPERATIONS TRANSPORTING B21Mechanical metalworking B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for Manufacture of tubes of special shape

Current Industry

B21C37/121with non-welded and non-soldered seams

Industries

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Patents Grantslast 30 patents

Information Patent Grant
Method for producing a carcass, a method of producing a flexible pi...
- Patent number 12,011,750
- Issue date Jun 18, 2024
- National Oilwell Varco Denmark I/S
- Lasse Tang Koch
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Elbow-shaped duct manufacturing apparatus
- Patent number 11,975,373
- Issue date May 7, 2024
- Sung Keun Noh
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Armoured cable and its manufacture
- Patent number 11,554,400
- Issue date Jan 17, 2023
- Marc Fitzner
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Immobilised insert
- Patent number 11,085,561
- Issue date Aug 10, 2021
- Baker Hughes Energy Technology UK Limited
- Leigh Shippen
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Tubular core and method
- Patent number 10,933,455
- Issue date Mar 2, 2021
- Pacific Roller Die Company, Inc.
- Robert F. Miller
- B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
Information Patent Grant
Apparatus for forming in continuous a spiral seamed conduit, formin...
- Patent number 10,857,579
- Issue date Dec 8, 2020
- ZEFFIRO SRL
- Gino Guasti
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Elongate tape element and method
- Patent number 10,683,951
- Issue date Jun 16, 2020
- GE Oil & Gas UK Limited
- Andrew Peter Roberts
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Machine for working ribbon-shaped elements
- Patent number 10,583,474
- Issue date Mar 10, 2020
- Byte Line Di Pelissero Alessandro
- Alessandro Pelissero
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Elongate tape element and method
- Patent number 10,465,824
- Issue date Nov 5, 2019
- GE Oil & Gas UK Limited
- Suranjith Warnakulasuriya
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Manufacturing method for interlocked tube and manufacturing device...
- Patent number 10,350,660
- Issue date Jul 16, 2019
- SHOWA RASENKAN SEISAKUSHO CO., LTD.
- Norifusa Suzuki
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Flexible pipe carcass for controlling flow induced vibration in a r...
- Patent number 10,203,052
- Issue date Feb 12, 2019
- Statoil Petroleum AS
- Knut-Aril Farnes
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Elongate tape element and method
- Patent number 10,018,289
- Issue date Jul 10, 2018
- GE Oil & Gas UK Limited
- Suranjith Warnakulasuriya
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Systems and methods for forming a pipe carcass using multiple strip...
- Patent number 9,962,750
- Issue date May 8, 2018
- Bartell Machinery Systems, LLC
- Walter Frederick Thompson
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Method and apparatus for manufacturing interlocking pipe
- Patent number 9,945,499
- Issue date Apr 17, 2018
- SHOWA RASENKAN SEISAKUSHO CO., LTD.
- Norifusa Suzuki
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Method and apparatus for cutting openings in sidewall of spiral pipe
- Patent number 9,782,812
- Issue date Oct 10, 2017
- Roderick Clarence Minch
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Openable corrugated hose, cable harness and method for producing an...
- Patent number 9,759,360
- Issue date Sep 12, 2017
- Schlemmer GmbH
- Van Ngoc Chu
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Flexible pipe carcass forming apparatus
- Patent number 9,643,226
- Issue date May 9, 2017
- Bartell Machinery Systems, LLC
- Walter F. Thompson
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Process for manufacturing a wound hose, particularly a spiral wound...
- Patent number 9,446,439
- Issue date Sep 20, 2016
- BOA Balg- und Kompensatoren- Technologie GmbH
- Henrik Hof
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Flexible tube, manufacturing method and apparatus
- Patent number 9,440,273
- Issue date Sep 13, 2016
- Paul McMillen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Supply device, and method for supplying band-like member
- Patent number 9,272,322
- Issue date Mar 1, 2016
- Sekisui Chemical Co., Ltd.
- Jun Tsuda
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Concrete reinforcing members, and associated methods of manufacture...
- Patent number 8,991,132
- Issue date Mar 31, 2015
- EMPIRE TECHNOLOGY DEVELOPMENT LLC
- Sukho Jung
- C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
Information Patent Grant
Manufacturing apparatus and method of spiral duct including elbow
- Patent number 8,915,109
- Issue date Dec 23, 2014
- Jinwoong Technology Co., Ltd.
- Kyu-seok Cha
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Method for manufacturing a flexible piping device for an exhaust ga...
- Patent number 8,793,859
- Issue date Aug 5, 2014
- SJM Co. Ltd.
- Dae Hyun Kim
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Machine to produce expanded metal spirally lock-seamed tubing from...
- Patent number 8,578,577
- Issue date Nov 12, 2013
- Helix International, Inc.
- Wilhelmus P. H. Castricum
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Machine to produce expanded metal spirally lock-seamed tubing from...
- Patent number 8,578,576
- Issue date Nov 12, 2013
- Helix International, Inc.
- Wilhelmus P. H. Castricum
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Joint jig of spiral duct manufacturing apparatus
- Patent number 8,522,587
- Issue date Sep 3, 2013
- Jinwoong Technologies Co., Ltd.
- Kyu-Seok Cha
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Method and apparatus for manufacturing a wrap-around tube
- Patent number 8,236,120
- Issue date Aug 7, 2012
- Novelis Deutschland GmbH
- Christian Muller
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Pinch-point lock-seam tubing, pinch point seaming devices, and meth...
- Patent number 7,775,076
- Issue date Aug 17, 2010
- Trevor Dale Schultz
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Apparatus and method for manufacturing spiral duct
- Patent number 7,730,754
- Issue date Jun 8, 2010
- Jinwoong Technology
- Kyu-Seok Cha
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Apparatus for producing helically corrugated metal pipe and related...
- Patent number 7,574,886
- Issue date Aug 18, 2009
- Contech Construction Products Inc.
- William L. Zepp
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...

Patents Applicationslast 30 patents

Information Patent Application
A METHOD FOR PRODUCING A CARCASS, A METHOD OF PRODUCING A FLEXIBLE...
- Publication number 20230271241
- Publication date Aug 31, 2023
- NATIONAL OILWELL VARCO DENMARK I/S
- Lasse Tang Koch
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Elbow-Shaped Duct Manufacturing Apparatus
- Publication number 20220184681
- Publication date Jun 16, 2022
- Sung Keun NOH
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Tubular core and method
- Publication number 20220001430
- Publication date Jan 6, 2022
- Pacific Roller Die Company, Inc.
- Robert F. Miller
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
IMPROVEMENTS IN ARMOURED CABLE AND ITS MANUFACTURE
- Publication number 20210101196
- Publication date Apr 8, 2021
- Marc FITZNER
- D07 - ROPES CABLES OTHER THAN ELECTRIC
Information Patent Application
APPARATUS FOR FORMING IN CONTINUOUS A SPIRAL SEAMED CONDUIT, FORMIN...
- Publication number 20200230675
- Publication date Jul 23, 2020
- Gino GUASTI
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
IMMOBILISED INSERT
- Publication number 20190316711
- Publication date Oct 17, 2019
- GE Oil & Gas UK Limited
- Leigh Shippen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
DEVICE AND METHOD FOR PRODUCING STRIP WOUND TUBES
- Publication number 20190193132
- Publication date Jun 27, 2019
- Westfalia Metallschlauchtechnik GmbH & Co. KG
- KARSTEN SCHENK
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information Patent Application
Apparatus and method for a helically perforated wound duct
- Publication number 20180318896
- Publication date Nov 8, 2018
- Jeffrey Jonathan Bell
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
ELONGATE TAPE ELEMENT AND METHOD
- Publication number 20180299039
- Publication date Oct 18, 2018
- GE Oil & Gas UK Limited
- Suranjith Warnakulasuriya
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Rectangilar-Ribbed Profile Tubular Core and Method
- Publication number 20180099320
- Publication date Apr 12, 2018
- Pacific Roller Die Company, Inc.
- Robert F. Miller
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
OPENABLE CORRUGATED HOSE, CABLE HARNESS AND METHOD FOR PRODUCING AN...
- Publication number 20170030498
- Publication date Feb 2, 2017
- SCHLEMMER GMBH
- Van Ngoc Chu
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
MANUFACTURING METHOD FOR INTERLOCKED TUBE AND MANUFACTURING DEVICE...
- Publication number 20160175904
- Publication date Jun 23, 2016
- SHOWA RASENKAN SEISAKUSHO CO., LTD.
- Norifusa SUZUKI
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
ELONGATE TAPE ELEMENT AND METHOD
- Publication number 20160069485
- Publication date Mar 10, 2016
- GE Oil & Gas UK Limited
- Suranjith Warnakulasuriya
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
ELONGATE TAPE ELEMENT AND METHOD
- Publication number 20160069486
- Publication date Mar 10, 2016
- Andrew Peter Roberts
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Method and Apparatus for Cutting Openings in Sidewall of Spiral Pipe
- Publication number 20150273552
- Publication date Oct 1, 2015
- Roderick Clarence Minch
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
FLEXIBLE PIPE CARCASS FORMING APPARATUS
- Publication number 20140238094
- Publication date Aug 28, 2014
- BARTELL MACHINERY SYSTEMS LLC
- Walter F. Thompson
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
SUPPLY DEVICE, AND METHOD FOR SUPPLYING BAND-LIKE MEMBER
- Publication number 20140190236
- Publication date Jul 10, 2014
- SEKISUI CHEMICAL CO., LTD.
- Jun Tsuda
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
STRIP GUIDANCE SYSTEM FOR MACHINES THAT FORM PIPES FROM CONTINUOUS...
- Publication number 20130333431
- Publication date Dec 19, 2013
- BRASTEC TECHNOLOGIES LTDA.
- Maurice Ferdinand Bernard Maria Russel
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Flexible Tube, Manufacturing Method and Apparatus
- Publication number 20130319722
- Publication date Dec 5, 2013
- Paul McMillen
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
PROCESS FOR MANUFACTURING A WOUND HOSE, PARTICULARLY A SPIRAL WOUND...
- Publication number 20130233433
- Publication date Sep 12, 2013
- Henrik Hof
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
CONCRETE REINFORCING MEMBERS, AND ASSOCIATED METHODS OF MANUFACTURE...
- Publication number 20130167755
- Publication date Jul 4, 2013
- EMPIRE TECHNOLOGY DEVELOPMENT LLC
- Sukho Jung
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
SPIRALLY WOUND CHANNEL CORE
- Publication number 20130015287
- Publication date Jan 17, 2013
- J. Daniel Bryant
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
Method For Manufacturing A Flexible Piping Device For An Exhaust Ga...
- Publication number 20120103051
- Publication date May 3, 2012
- SJM Co. Ltd.
- Dae Hyun Kim
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
FORMING HEAD FOR FORMING SPIRALLY SEAMED TUBE
- Publication number 20120103046
- Publication date May 3, 2012
- Carina Petersson
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND TUBULAR...
- Publication number 20120042705
- Publication date Feb 23, 2012
- ITI SCOTLAND LIMITED
- Richard Martin Curtis
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
WINDING APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND...
- Publication number 20120036910
- Publication date Feb 16, 2012
- ITI SCOTLAND LIMITED
- Vic Leedham
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND TUBULAR...
- Publication number 20110277525
- Publication date Nov 17, 2011
- ITI SCOTLAND LIMITED
- Richard Martin Curtis
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND TUBULAR...
- Publication number 20110271730
- Publication date Nov 10, 2011
- ITI SCOTLAND LIMITED
- Richard Martin Curtis
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
MANUFACTURING APPARATUS AND METHOD OF SPIRAL DUCT INCLUDING ELBOW
- Publication number 20110072875
- Publication date Mar 31, 2011
- JINWOONG TECHNOLOGY CO., LTD.
- Kyu-seok Cha
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Application
JOINT JIG OF SPIRAL DUCT MANUFACTURING APPARATUS
- Publication number 20110072650
- Publication date Mar 31, 2011
- Jinwoong Technology Co., Ltd.
- Kyu-seok Cha
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...

with non-welded and non-soldered seams

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Method for producing a carcass, a method of producing a flexible pi...

Elbow-shaped duct manufacturing apparatus

Armoured cable and its manufacture

Immobilised insert

Tubular core and method

Apparatus for forming in continuous a spiral seamed conduit, formin...

Elongate tape element and method

Machine for working ribbon-shaped elements

Elongate tape element and method

Manufacturing method for interlocked tube and manufacturing device...

Flexible pipe carcass for controlling flow induced vibration in a r...

Elongate tape element and method

Systems and methods for forming a pipe carcass using multiple strip...

Method and apparatus for manufacturing interlocking pipe

Method and apparatus for cutting openings in sidewall of spiral pipe

Openable corrugated hose, cable harness and method for producing an...

Flexible pipe carcass forming apparatus

Process for manufacturing a wound hose, particularly a spiral wound...

Flexible tube, manufacturing method and apparatus

Supply device, and method for supplying band-like member

Concrete reinforcing members, and associated methods of manufacture...

Manufacturing apparatus and method of spiral duct including elbow

Method for manufacturing a flexible piping device for an exhaust ga...

Machine to produce expanded metal spirally lock-seamed tubing from...

Machine to produce expanded metal spirally lock-seamed tubing from...

Joint jig of spiral duct manufacturing apparatus

Method and apparatus for manufacturing a wrap-around tube

Pinch-point lock-seam tubing, pinch point seaming devices, and meth...

Apparatus and method for manufacturing spiral duct

Apparatus for producing helically corrugated metal pipe and related...

Patents Applicationslast 30 patents

A METHOD FOR PRODUCING A CARCASS, A METHOD OF PRODUCING A FLEXIBLE...

Elbow-Shaped Duct Manufacturing Apparatus

Tubular core and method

IMPROVEMENTS IN ARMOURED CABLE AND ITS MANUFACTURE

APPARATUS FOR FORMING IN CONTINUOUS A SPIRAL SEAMED CONDUIT, FORMIN...

IMMOBILISED INSERT

DEVICE AND METHOD FOR PRODUCING STRIP WOUND TUBES

Apparatus and method for a helically perforated wound duct

ELONGATE TAPE ELEMENT AND METHOD

Rectangilar-Ribbed Profile Tubular Core and Method

OPENABLE CORRUGATED HOSE, CABLE HARNESS AND METHOD FOR PRODUCING AN...

MANUFACTURING METHOD FOR INTERLOCKED TUBE AND MANUFACTURING DEVICE...

ELONGATE TAPE ELEMENT AND METHOD

ELONGATE TAPE ELEMENT AND METHOD

Method and Apparatus for Cutting Openings in Sidewall of Spiral Pipe

FLEXIBLE PIPE CARCASS FORMING APPARATUS

SUPPLY DEVICE, AND METHOD FOR SUPPLYING BAND-LIKE MEMBER

STRIP GUIDANCE SYSTEM FOR MACHINES THAT FORM PIPES FROM CONTINUOUS...

Flexible Tube, Manufacturing Method and Apparatus

PROCESS FOR MANUFACTURING A WOUND HOSE, PARTICULARLY A SPIRAL WOUND...

CONCRETE REINFORCING MEMBERS, AND ASSOCIATED METHODS OF MANUFACTURE...

SPIRALLY WOUND CHANNEL CORE

Method For Manufacturing A Flexible Piping Device For An Exhaust Ga...

FORMING HEAD FOR FORMING SPIRALLY SEAMED TUBE

APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND TUBULAR...

WINDING APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND...

APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND TUBULAR...

APPARATUS FOR AND METHOD OF MANUFACTURING A HELICALLY WOUND TUBULAR...

MANUFACTURING APPARATUS AND METHOD OF SPIRAL DUCT INCLUDING ELBOW

JOINT JIG OF SPIRAL DUCT MANUFACTURING APPARATUS