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C W B DEV CO

C W B DEV
Active Patents
0
Total Holdings
2

Patent Holdings

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Patent No. Title Status Filing Date Grant Date Claims Actions
US2229293A Magnetic recording system Expired / Lapsed 1938-06-14 1941-01-21 0 Details
US2200351A Business dictating system Expired / Lapsed 1938-11-23 1940-05-14 0 Details