Dual stethoscope microphone

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

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D2402

Patent

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D02569515

REFERENCES:
patent: D208125 (1967-07-01), Cefaly
patent: D213257 (1969-01-01), Littmann
patent: D214002 (1969-04-01), Machlup et al.
patent: 3124211 (1964-03-01), Cefaly
patent: 3630308 (1971-12-01), Ravin
patent: 3951230 (1976-04-01), Littmann

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