Intercom speaker and receiver

Details Intercom speaker and receiver Intercom speaker and receiver

1979-09-27

1983-07-19

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D14 58, D14 92, D1403

Patent

active

D02697807

REFERENCES:
patent: D199677 (1964-12-01), Mattingly
patent: D243536 (1977-03-01), Van de Poel
patent: D244469 (1977-05-01), Buchin
patent: D255032 (1980-05-01), Maddock

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