External unit for intercom

Details External unit for intercom External unit for intercom

1988-01-26

1991-01-08

Ansher, Bernard

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Intercom

Patent

active

D03135942

REFERENCES:
patent: D282360 (1986-01-01), Yamagata et al.
HKE, 11/87, p. 141, Monitoring System.

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