Official Gazette of the United States Patent Office
Sponsored by the American Institute of Bolt, Nut, and Rivet Manufacturers. ... of stock-production sizes of square-head and hexagon-head machine bolts, ... and appurtenances thereof, also piping, valves, fittings, flanges, safety valves, etc., ...
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Official Gazette of the United States Patent Office's website is slagerijbuth.nl