Sight glass

Details Sight glass Sight glass

1999-03-25

2000-04-25

Mortimer, Paula A.

Photography and optical equipment

Optical article not elsewhere specified

Lens or objective

1606

Patent

active

D0423538&

REFERENCES:
patent: D260401 (1981-08-01), Leopoldi
patent: D276731 (1984-12-01), Steinor
patent: D334940 (1993-04-01), Wolinsky
patent: 1724716 (1929-08-01), Kryzanowsky
patent: 1833971 (1932-10-01), Kryzanowsky
patent: 2301460 (1942-11-01), Sauer
patent: 2312542 (1943-03-01), Goodman
patent: 2620660 (1952-12-01), Goldsmith
patent: 2943530 (1960-07-01), Nagel
patent: 2961108 (1960-11-01), Johnson
patent: 3345870 (1967-10-01), Yoshinaga
patent: 4099851 (1978-07-01), Rethore
patent: 4704983 (1987-11-01), Rung
patent: 5193032 (1993-03-01), Hirth

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