Category:Carrier telephony

See also Wikipedia article: Special:Search/carrier+telephony.

Media in category "Carrier telephony"

The following 2 files are in this category, out of 2 total.

The Bell System technical journal (1922) (14569462577).jpg 3,216 × 1,500; 1,002 KB
The Bell System technical journal (1922) (14756491305).jpg 2,848 × 1,528; 624 KB

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