Combined mounting for through-the-wall viewer and intercom

Details Combined mounting for through-the-wall viewer and intercom Combined mounting for through-the-wall viewer and intercom

1978-03-23

1978-12-19

Claffy, Kathleen H.

179 1E, H04M 100, H04R 128

Patent

active

041307283

ABSTRACT:
Seeing and talking through a wall or closed door is conveniently provided by the combination of a one-way observation telescope projecting through the door and a pair of intercom units, one on each side of the door. Each intercom housing has a flange with a hole such that the units may be supported cooperatively by the telescope ends. Each housing may also have protruding tips against the door surface to prevent rotation of the housing.

REFERENCES:
patent: 2169874 (1939-08-01), Hardt
patent: 3404234 (1968-10-01), Batt et al.

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