Hearing aid

Medical and laboratory equipment – Equipment for diagnosis – analysis – or treatment – Orthopedic or chiropractic

Patent

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Details

D24 67, D2499

Patent

active

D02662710

REFERENCES:
patent: D141071 (1945-05-01), Hechler
patent: D206665 (1967-01-01), Sanzone
patent: D221442 (1971-08-01), Feingold
patent: 2325590 (1943-08-01), Carlisle et al.
patent: 3126977 (1964-03-01), McGee
patent: 3586794 (1971-06-01), Michaelis
patent: 3702123 (1972-11-01), Macken et al.
patent: 4010820 (1977-03-01), Johnson

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