Method of making split-wedge gate valves
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1. THE METHOD OF MANUFACTURING SPLIT-WEDGE GATE VALVE APPARATUS WHICH COMPRISES ROUGHLY FORMING A PLURALITY OF SPLIT-WEDGE METAL GATE VALVE ELEMENTS EACH WITH A BALLAND-SOCKET TYPE MATING CONNECTION SURFACE ON ONE SIDE THEREOF MERGED WITH A RELATIVELY BROAD-AREA REFERENCE SURFACE, BOTH OF WHICH SURFACES ARE SUBSTANTIALLY IRREGULAR IN THE ROUGH-FORMED CONDITION, SUBJECTING EACH OF SAID ELEMENTS TO PRESSURE OF COINING DIE MEMBERS SUFFICIENT TO
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1. THE METHOD OF MANUFACTURING SPLIT-WEDGE GATE VALVE APPARATUS WHICH COMPRISES ROUGHLY FORMING A PLURALITY OF SPLIT-WEDGE METAL GATE VALVE ELEMENTS EACH WITH A BALLAND-SOCKET TYPE MATING CONNECTION SURFACE ON ONE SIDE THEREOF MERGED WITH A RELATIVELY BROAD-AREA REFERENCE SURFACE, BOTH OF WHICH SURFACES ARE SUBSTANTIALLY IRREGULAR IN THE ROUGH-FORMED CONDITION, SUBJECTING EACH OF SAID ELEMENTS TO PRESSURE OF COINING DIE MEMBERS SUFFICIENT TO
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