Intercom door answering unit

Details Intercom door answering unit Intercom door answering unit

1984-06-11

1987-05-12

Ansher, Bernard

Recording, communication, or information retrieval equipment

Computer, data processor equipment

Patent

active

D02897547

REFERENCES:
patent: D279471 (1985-07-01), Nakashima
patent: D282360 (1986-01-01), Yamagata et al.
patent: D283130 (1986-03-01), Boenning
patent: 3453390 (1969-07-01), Durkee et al.
patent: 4518826 (1985-05-01), Caudill et al.
patent: 4584436 (1986-04-01), Boenning et al.
Radio Shack 1983 Catalog, p. 109, top left of page.

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