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Producing of tapered bent tube
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Patent number 6,153,029
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Issue date Nov 28, 2000
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Wei-Fu Lin
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Method of making a curved pipe
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Patent number 5,014,424
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Issue date May 14, 1991
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Kabushiki Kaisha Okada Seisakusho
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Tamotsu Takasugi
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Method for the manufacture of a pipe bend
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Patent number 4,554,816
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Issue date Nov 26, 1985
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Mannesmann Aktiengesellschaft A.G.
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Erich Stender
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Machine for forming curved conduits
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Patent number 4,287,742
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Issue date Sep 8, 1981
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John H. Heiman
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Sheet metal drafting device
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Patent number 4,215,481
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Issue date Aug 5, 1980
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Robert L. Riley
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Formation of radius elbows and O.G. sets
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Patent number 4,210,090
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Issue date Jul 1, 1980
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Potomac Applied Mechanics, Inc.
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James H. Stubbings
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Drawing die for making a pipe elbow
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Patent number 4,192,170
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Issue date Mar 11, 1980
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Josef Ferwagner
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3899819
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Patent number 3,899,819
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Issue date Aug 19, 1975
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3848308
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Patent number 3,848,308
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Issue date Nov 19, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3833985
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Patent number 3,833,985
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Issue date Sep 10, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3807009
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Patent number 3,807,009
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Issue date Apr 30, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3802245
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Patent number 3,802,245
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Issue date Apr 9, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2335887
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Patent number 2,335,887
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Issue date Dec 7, 1943
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2254117
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Patent number 2,254,117
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Issue date Aug 26, 1941
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2192471
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Patent number 2,192,471
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Issue date Mar 5, 1940
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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2004491
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Patent number 2,004,491
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Issue date Jun 11, 1935
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...