1968 Press Photo Bell Telephone Laboratories - RRV65243

Name: 1968 Press Photo Bell Telephone Laboratories - RRV65243
Brand: RRV
SKU: RRV65243
Price: 19.99 USD
Availability: InStock

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$19.99

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Description

Photo measures 8 x 10 in. Robert Spencer, Bell Telephone Laboratories, checks an electronic tone ringer designed for the hard of hearing. Microphones are mounted on the spinning device in foreground to simulate for Spencer what hard-of-hearing persons hear when the phone equipped with the ringer actually rings.

1968 Press Photo Bell Telephone Laboratories - RRV65243

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