Western Electric
SpeakerPhone 55D Control Unit
(Click Picture to Enlarge)
Documentation:
SpeakerPhone System 3-Type 660A1 Telephone Set Connections and Maintenance
Section 512-620-460
Issue 3, November 1970
SpeakerPhone System 3-Type
Section 512-620-100
Issue 7, October 1978
SpeakerPhone System 3-Type
565-, 1565-, And 2565-Type Telephone Sets
Section 512-620-420
Issue 4, April 1974
SpeakerPhone System 3-Type
568HAA And 2568HAA Telephone Sets
Section 512-620-430
Issue 2, April 1974
SpeakerPhone System 3-Type
500R/S, 1500S, And 2500S Telephone Set
Section 512-620-410
Issue 3, December 1972
AT&T
Bell System
Bell Labs
Related Links:
http://davidszondy.com/future/Living/picturephone.htm
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