Spectacle front

Details Spectacle front Spectacle front

1976-10-28

1978-03-07

Lucas, Susan J.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1606

Patent

active

D02474409

REFERENCES:
patent: D187752 (1960-04-01), Lindblom
patent: D199932 (1964-12-01), Shindler
patent: D199933 (1964-12-01), Shindler

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