Door viewing apparatus

Details Door viewing apparatus Door viewing apparatus

1992-11-23

1994-04-19

Sugarman, Scott J.

Optical: systems and elements

Compound lens system

Telescope

359406, G02B 2308

Patent

active

053051408

ABSTRACT:
A periscope structure is mounted to a door assembly to accommodate individuals restricted relative to standing, wherein the periscope structure is vertically adjustable and is arranged for ease of mounting to the associated door structure employing a mounting housing organization.

REFERENCES:
patent: 3204523 (1965-09-01), Daily
patent: 4921339 (1990-05-01), Brischke

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