| Pipes by Solplast AB disclosed in a catalogue entitled "Svensk Byggkatalog Arp-87", issued by Svensk Byggtajanst in 1987. |
| Product NPU disclosed in a catalogue entitled "Ventilation-88", issed by Lindab AB in 1988. |
| Product ESIU disclosed in a catalogue entitled "Ventilation-88", issued by Lindab AB in 1988. |
| Product IK disclosed in a catalogue entitled "Ventilation-88", issued by Lindab AB in 1988. |
| General drawings No. J299102, producted by the Swedish company Flakt and dated Nov. 19, 1981 (811119). |
| Catalogue entitled "Kanalsystem VELODUCT", issued by Flakt in 1982. |
| Curve Cutting Machine Delta 2 issued by Emil Ster Maschinenfabrik AG, CH-5703 Seon/Schweiz (English translation). |
| Product Catalog entitled "Ducts and Fittings," issued by Lindab AB, Caswell Road, Brackmills Industrial Estate, Northampton NN4 OBR, England, 52 pages, first distributed in 1987. |
| Product Catalog entitled "Circular Duct System," issued by Lindab AB, 45 Caswell Road, Brackmills Buiness Park, Northampton NH4 OPW, England, 42 pages, Mar. 1992. |
| Swedish-language Product Catalog entitled "VELODUCT Cirkulart kanalsystem," issued by Flakt VELODUCT AB, Prastg.ang.rdsvagen 15, Box 84, 153 00 Jarna, Sweden, 29 pages, Jun. 1991. |
| Product literature entitled "SPIRO Bend Segment Cutting Machine I" issued by Spiro Investment AG, Industriestrasse, CH-3178 Boesingen, Switzerland, 2 pages, first distributed c. 1978. |
| Product literature entitled "SPIRO Bend Segment Cutting Machine II" issued by SPIRO Investment AG, Industriestrasse, CH-3178 Boesingern, Switzerland, 6 pages, first distributed c. 1980. |
| German-language Product literature entitled "Kurven-schneidemaschine delta 2," issued by SUTER AG SEON, 5703 Seon/Schweiz, Switzerland, 6 pages, first distributed c. 1982. |
| Product literature entitled "Seam Forming and Locking Machine beta 2," issued by SUTER AG SEON, 5703 Seon/Schweiz, Switzerland, 4 pages, first distributed c. 1982. |
Patent Grant
D360018
