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Associated Telephone and Telegraph Co

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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
US2248784A Electrical signaling system Expired / Lapsed 1939-01-18 1941-07-08 0 Details
US1789811A Counting or reglstering apparatus Expired / Lapsed 1924-09-29 1931-01-20 0 Details