Photography and optical equipment – Optical article not elsewhere specified – Lens or objective
Patent
1987-02-13
1990-03-27
Holtje, Nelson C.
Photography and optical equipment
Optical article not elsewhere specified
Lens or objective
Patent
active
D03068684
REFERENCES:
patent: 2616647 (1952-11-01), Murchison
patent: 2767854 (1956-10-01), Barrett
patent: 2884220 (1959-04-01), Manley
patent: 2949683 (1960-08-01), Glover
patent: 3377042 (1968-04-01), Breeding et al.
patent: 4011953 (1977-03-01), Engelman
Heflin Clare E.
Holtje Nelson C.
Pravel B. R.
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