Collapsible hand-held periscope

Details Collapsible hand-held periscope Collapsible hand-held periscope

1988-10-12

1990-07-24

Word, A. Hugo

Photography and optical equipment

Optical article not elsewhere specified

Telescope

Patent

active

D03094677

REFERENCES:
patent: D160304 (1950-10-01), Crichton
patent: D236284 (1975-08-01), Miller
patent: 1837208 (1931-12-01), Cover

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