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Bin-Aural stethoscope for auscultation of engines. 1940

Bin-Aural Phonondescope. Manufactured in the 40's. Used for the auscultation of sounds.

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Bin-Aural Phonondescope. Manufactured in the 40's. Used for the auscultation of the sounds of the different parts of an engine, and to be able to detect breakdowns even before they occur. Complete, even with its original instructions.

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