Baseball shaped transparency viewer

Details Baseball shaped transparency viewer Baseball shaped transparency viewer

1997-11-24

1998-11-24

Shooman, Ted

Photography and optical equipment

Projector or viewer

Integrated unit

D21713, 1602

Patent

active

D04016050

REFERENCES:
patent: D115766 (1939-07-01), Ronacher
patent: D149554 (1948-05-01), Halbriter
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patent: 271838 (1883-02-01), Gould
patent: D339239 (1993-09-01), Perkins
patent: D340075 (1993-10-01), Turner
patent: 2345416 (1944-03-01), Naramore
patent: 2630642 (1953-03-01), Mast et al.
patent: 3026640 (1962-03-01), Ogdon
patent: 3707052 (1972-12-01), Clark
patent: 4685231 (1987-08-01), Brown

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