Telephony, a manual of the design, construction, and operation of telephone exchanges p.4

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Vol. 1. The location of central office.- Vol. 2. Construction of underground conduits.- Vol. 3. Construction of cable plant.- Vol. 4. Construction of aerial lines.- Vol. 5. The Substation.- Vol. 6. Switchboards [and] the central office 14
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ISBN:

0470903198

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