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| Patents for B21K 21 - Making hollow articles not covered by any single one of groups (1,317) |
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| 12/12/1978 | CA1044163A1 High pressure fuel injection pipe and a method of making the same | | 07/25/1978 | US4102167 Method of manufacturing integral fluid pressure rupturable apparatus | | 07/18/1978 | US4100781 Axle spindle forming method | | 04/18/1978 | US4084423 Method for forming a track link bushing having a contoured opening | | 02/14/1978 | US4073174 Process of forging large seamless ferrous-metal welding necks and other cylindrical articles | | 01/17/1978 | US4068518 Method of manufacturing an extruded steel component | | 12/13/1977 | US4062701 Method of forming end flanges | | 11/22/1977 | US4059003 Process for producing heavy-duty high-pressure ferrous metal cup-shaped products having a cylindrical barrel | | 09/13/1977 | US4047415 Apparatus for shaping the end of a hollow tube | | 08/09/1977 | US4040875 Ductile cast iron articles | | 07/05/1977 | US4033163 Apparatus for swaging tubular material | | 04/19/1977 | US4018075 Plastic working dies for cylindrical parts | | 08/31/1976 | US3977227 Method of cold extruding ductile cast iron tube | | 08/31/1976 | US3977225 Forging method | | 07/13/1976 | US3968919 Method of forging a solid head on a hollow steel tube | | 04/20/1976 | US3950978 Stretch-forming of long tubes | | 04/06/1976 | US3948073 Apparatus and method of metal forming |
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