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FRANK F ROWELL SR

FRANK F RO
Active Patents
0
Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2298589A Electric discharge apparatus Expired / Lapsed 1939-10-12 1942-10-13 0 Details
US2260680A Traffic signaling device for vehicles Expired / Lapsed 1940-02-05 1941-10-28 0 Details