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| Patents for B21D 13 - Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form (2,021) |
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| 11/01/1977 | US4055981 Portable guardrail straightener for field use | | 10/11/1977 | US4052948 Method and apparatus for making rectangular corrugated expansion joints | | 09/13/1977 | US4047417 Deeply embossed sheet product and method and apparatus for the production thereof | | 07/26/1977 | US4037629 Portable crimping device | | 07/12/1977 | US4034453 Method of manufacturing louver fins for use in heat exchanger | | 06/07/1977 | US4027517 Method and apparatus for embossing sheet metal strip and sheet metal panel | | 05/31/1977 | US4027058 Folded structural panel | | 05/24/1977 | US4025035 Method of affixing surface enlarging members in the form of coherent, transversally corrugated metal strips to elongate metal basic profiles | | 05/10/1977 | US4022050 Method of manufacturing a heat exchanger steel | | 05/03/1977 | US4020666 Mobile forming machine with embossing rolls | | 05/03/1977 | US4020603 Roof for railway car | | 02/22/1977 | US4008591 Device for zigzag folding of strip material | | 12/21/1976 | US3998600 Rolling metal ribbon stock into convoluted fin, zig-zag | | 12/21/1976 | US3998140 Machine for manufacturing corrugated structures | | 11/16/1976 | US3992330 Aluminum strip with corrugations of ferritic steel | | 11/16/1976 | US3992162 Sheet with alternate protrusions and recesses | | 11/02/1976 | US3988917 Apparatus and method for making a chevron matrix strip | | 07/27/1976 | US3971243 Method for die forming strip material | | 06/29/1976 | US3966646 Fabricating bodies | | 03/02/1976 | US3940966 Apparatus for shaping sheet material | | 03/02/1976 | US3940965 Method and apparatus for forming corrugating pipe |
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