Football shaped transparency viewer

Photography and optical equipment – Projector or viewer – Integrated unit

Patent

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Details

D9307, D21712, 1602

Patent

active

D04210344

REFERENCES:
patent: D239997 (1976-05-01), Burin et al.
patent: D259610 (1981-06-01), Martin
patent: D340078 (1993-10-01), Turner
patent: D351736 (1994-10-01), Shook
patent: D384716 (1997-10-01), Stevens

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