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| Patents for B21D 31 - Other methods for working sheet metal, metal tubes, metal profiles (2,523) |
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| 08/30/1977 | US4045311 Process for making a minute hole | | 04/12/1977 | US4016741 Bracelet domer | | 03/29/1977 | US4014199 Apparatus and method for providing an electrical contact with a tip portion substantially free of burrs | | 02/15/1977 | US4007616 Cylindrical containers by hour glass formation of metal tubes | | 01/18/1977 | US4003235 Apparatus for making a multifinger contact | | 01/04/1977 | US4001542 Method and apparatus for forming a stream feeder | | 12/14/1976 | US3996783 Method and apparatus for reforming round ducts into rectangular ducts | | 11/30/1976 | US3994055 Method of preparing rain gutters for connection thereto of downspouts | | 10/26/1976 | US3987521 Machine for making expanded metal | | 10/26/1976 | US3987520 Machine for making expanded metal | | 10/19/1976 | US3986654 Method for making tubular members and product thereof | | 09/07/1976 | US3978705 Method and apparatus for the manufacture of a thin sheet orifice plate | | 08/24/1976 | US3975945 Apparatus for testing pipe for leaks | | 07/06/1976 | US3967452 Rain gutter and downspout connection | | 06/29/1976 | US3965550 Machine for making expanded metal | | 06/08/1976 | US3961519 Hammer for sheet metal | | 04/06/1976 | US3947941 Method of making a heat exchanger | | 04/06/1976 | US3947936 Coining expanded metal positive lead-acid battery grids | | 03/23/1976 | US3945097 Apparatus for making expanded metal lead-acid battery grids | | 02/24/1976 | US3939683 Piercing tools | | 02/17/1976 | US3938436 Selective embossing press with drum stop means | | 02/03/1976 | US3936624 Multifinger contact | | 01/20/1976 | US3933021 Process or method of producing a small opening in a relatively thick metallic or pipe wall |
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