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Blackhawk Manufacturing Co

Blackhawk
Active Patents
0
Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2914369A Fluid seal Expired / Lapsed 1958-03-18 1959-11-24 0 Details
US2814540A Piston packing Expired / Lapsed 1956-07-16 1957-11-26 0 Details