Puck shaped transparency viewer

Photography and optical equipment – Projector or viewer – Integrated unit

Patent

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Details

D9307, D21710, 1602

Patent

active

D04217624

REFERENCES:
patent: D374897 (1996-10-01), Whisman
patent: 3039202 (1962-06-01), Close et al.
patent: 4878668 (1989-11-01), Nevoral
patent: 5564698 (1996-10-01), Honey et al.

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