Intercom

Details Intercom Intercom

1981-04-24

1984-07-03

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D14 56, D14 58

Patent

active

D02745178

REFERENCES:
patent: D238186 (1975-12-01), Kramer et al.
patent: D243536 (1977-03-01), Van de Poel
patent: D264967 (1982-06-01), Ender et al.
patent: D266509 (1982-10-01), Marshall
patent: 3515814 (1970-06-01), Morgan

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