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Orginal Maschinen und Motoren Defekt Sucher (SOLD)

Klicka på bilden för att förstora

Apparatebau C.Richter, Hamburg 1936.
Compare to a Stetoscop used by a doctor. With good traning you can hear sound in a engine and hopefully avoid disaster before the occur.
This example with nice KM markings, indicate naval usement