Liquid crystal sunglasses

Details Liquid crystal sunglasses Liquid crystal sunglasses

1989-11-20

1991-11-19

Ansher, Bernard

Photography and optical equipment

Ophthalmic article

Patent

active

D03217019

REFERENCES:
patent: D279904 (1985-07-01), Pulie
patent: D282372 (1986-01-01), Blaimschein
patent: D294953 (1988-03-01), Vitaloni
patent: D311012 (1990-10-01), Grange
patent: 4317240 (1982-03-01), Angerman et al.

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