2 Early Microphone Experimentation Models, 1885 : Lot 30

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Lot 30

2 Early Microphone Experimentation Models, 1885

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Description

2 Early Microphone Experimentation Models, 1885
Hand-made small run production. 1) With carbon grains. - And: 2) With coil. - Extraordinarily early test and demonstration models!

2 frühe Mikrophon-Versuchsmodelle, 1885
In Handarbeit hergestellte Kleinserie. 1) Mit Kohlekörnern. - Und: 2) Mit elektrischer Spule. - Außerordentlich seltene Experimentier- und Demonstrationsmodelle zur Telephon-Geschichte!