Underwater viewer

Details Underwater viewer Underwater viewer

1987-11-23

1990-10-16

Word, A. Hugo

Photography and optical equipment

Optical article not elsewhere specified

Patent

active

D03114104

REFERENCES:
patent: D220064 (1971-03-01), Warren
patent: 1451096 (1923-04-01), Hagen
patent: 2343473 (1944-03-01), Pierson
patent: 2496430 (1950-02-01), Berglund
patent: 2717399 (1955-09-01), Backhouse
patent: 2730921 (1956-01-01), Little
patent: 2795165 (1957-06-01), Vernier
patent: 2911878 (1959-11-01), Vernier
patent: 3619042 (1971-09-01), Lazar
patent: 4228751 (1980-10-01), Robertson et al.
patent: 4465468 (1984-08-01), Deacy

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