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4 results for: historical bell telephone laboratories

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Sergius P. Grace
UMG22A04_091

Sergius P. Grace

A Photograph Of Sound Waves
UMG20A21_359

A Photograph Of Sound Waves

Bell Lab Scientists At Work
UMG20A21_251

Bell Lab Scientists At Work

TV Demonstration At Bell Labs
UMG20A13_212

TV Demonstration At Bell Labs