Hand-held periscope

Details Hand-held periscope Hand-held periscope

1983-06-09

1984-12-18

Burke, Wallace R.

Photography and optical equipment

Optical article not elsewhere specified

Patent

active

D02768160

REFERENCES:
patent: D236284 (1975-08-01), Miller
patent: D240635 (1976-07-01), Peterson
patent: D245954 (1977-10-01), Tosaw
patent: D253414 (1979-11-01), Gomez
patent: 656496 (1900-08-01), Appleton
patent: 3140339 (1964-07-01), Nisperly et al.
patent: 3497293 (1970-02-01), Hill et al.
patent: 4161352 (1979-07-01), Felix et al.

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