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De Forest Radio Telephone & Telegraph Co

De Forest
Active Patents
0
Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US1751485A Frequency-changing method and means Expired / Lapsed 1924-05-01 1930-03-25 0 Details
US1585159A Thermal generator Expired / Lapsed 1924-02-02 1926-05-18 0 Details