Industrial Reference Service
The two American cable companiesa€”Western Union and Commercial Cable Co. ... such as RCA Communications, Inc., Mackay Radio and Telegraph, and Press Wireless, brought in under U. S. Army auspices their own transmitters, which they ... 11 35, 900 5.0 3 6, 500 18 Multiple manual exchanges. ... 54 56, 000 21.0 44 || 4 , 550 85 Local battery exchanges. ... Types of Telephone Exchanges and Their Capacity In service Equipped line capacity - ines in service Type of exchange Dec.
| Title | : | Industrial Reference Service |
| Author | : | |
| Publisher | : | - 1947 |
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