Speech module for an intercommunication system

Details Speech module for an intercommunication system Speech module for an intercommunication system

1987-11-12

1990-04-17

Ansher, Bernard

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Intercom

Patent

active

D03072738

REFERENCES:
patent: D220268 (1971-03-01), Kliewer
patent: D243536 (1977-03-01), van de Poel
patent: D282360 (1986-01-01), Yamagata et al.
patent: D283130 (1986-03-01), Boenning
patent: D297517 (1988-09-01), Yuen
patent: D299138 (1988-12-01), Hampf
patent: D301716 (1989-06-01), Ohzu

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