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Heller

Heller
Active Patents
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Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2321812A Tape driving system for magnetic sound recording machines a… Expired / Lapsed 1940-11-19 1943-06-15 0 Details
US2213631A Method of and apparatus for magnetically recording sound Expired / Lapsed 1937-10-25 1940-09-03 0 Details