Folder 300 - 379 Divisions - Transmission Sys & Testing
Categories
Folder 331 Division - Transmission Noise Testing
Central Office PBX Customer Lines and Equipment
Folder 332 Division - Voice-Frequency Equipment
Telephone Repeaters, Pilot Wire Regulators, Echo Suppressors, Composite Sets and Associated Equipment
Folder 362 Division - Type N, 0, and ON Carrier
362 Division - Type N, 0, and ON Carrier Telephone Systems and Associated Equipment Components
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