Combined door viewer and two-way intercom unit

Details Combined door viewer and two-way intercom unit Combined door viewer and two-way intercom unit

1983-11-30

1986-03-25

Corrigan, Jane E.

Recording, communication, or information retrieval equipment

Computer, data processor equipment

D10104

Patent

active

D02831309

REFERENCES:
patent: D204987 (1966-06-01), Iverson
patent: D210595 (1968-03-01), Kahn
patent: 2646496 (1953-07-01), Takach
patent: 2784252 (1957-03-01), Jones
Radio Shack, '75 Catalog, .COPYRGT.'74, p. 43, Item #43-226.

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