Sight glass

Details Sight glass Sight glass

1990-07-19

1993-04-20

Word, A. Hugo

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

Patent

active

D03349403

REFERENCES:
patent: 1485772 (1924-03-01), Du Pont
patent: 1501504 (1924-07-01), Truax
patent: 3020795 (1962-02-01), McKinney et al.
patent: 3345872 (1967-10-01), McGinnis
patent: 3438540 (1969-04-01), Le Roy
patent: 3936196 (1976-02-01), Wickersheim
patent: 4162826 (1979-07-01), Van der Belk et al.
patent: 4468095 (1984-08-01), Meginnis
patent: 4803876 (1989-02-01), Haynes

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