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with the aid of an oscillograph a Bell Laboratory scientist obtains a permanent record of the effect of vibration on electrical relay contacts

VIBRATION RECORD

E&MP 93.001

Oscilloscope

no date

With the aid of an oscillograph a Bell Laboratory scientist obtains a permanent record of the effect of vibration on electrical relay contacts.

Photo 979 73302


Original Caption by Science Service
© Bell Telephone Laboratories



National Museum of American History

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