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Emsco Derrick and Equipment Co

Emsco Derr
Active Patents
0
Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2264518A Valve operating means for duplex double-acting steam pumps Expired / Lapsed 1941-01-24 1941-12-02 0 Details
US2233649A Valve Expired / Lapsed 1938-05-10 1941-03-04 0 Details