Head for an overhead projector

Details Head for an overhead projector Head for an overhead projector

1975-12-19

1977-07-26

Spangler, Robert C.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1605

Patent

active

D02451654

REFERENCES:
patent: D179047 (1956-10-01), Wolk
patent: D215034 (1969-08-01), Steinbach
3M Overhead Projector Flier, 4-1968, p. 5, Model 88.

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