Combined eyeglasses with a stereo headset

Photography and optical equipment – Ophthalmic article

Patent

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D03420809

REFERENCES:
patent: 3503676 (1970-03-01), O'Neill
patent: 4888805 (1989-12-01), Karppala, Jr.
patent: 4901355 (1990-02-01), Moore
patent: 5159639 (1992-10-01), Shannon
patent: 5164987 (1992-11-01), Raven

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