Pocket-size photometer

Details Pocket-size photometer Pocket-size photometer

1978-01-19

1981-03-03

Kemper, Catherine E.

Photography and optical equipment

Projector or viewer

With provision for transparency magazine

D1605

Patent

active

D02584476

REFERENCES:
patent: D183218 (1958-07-01), Kerr et al.
patent: D185693 (1959-07-01), Asano
patent: 2472381 (1949-06-01), McMaster
patent: 3488125 (1970-01-01), Gugliotta et al.
patent: 3709615 (1973-01-01), Blakeslee et al.

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