Hinge for spectacles

Photography and optical equipment – Ophthalmic article – Element or attachment

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Patent

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D03678768

REFERENCES:
patent: D164889 (1951-10-01), Weissman
patent: D166578 (1952-04-01), Splaine
patent: 4618226 (1986-10-01), Sartor et al.
patent: 4976529 (1990-12-01), Segoshi et al.
patent: 5080476 (1992-01-01), Monin

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