Telephone; a manual of the design, construction, and operation of telephone exchanges ..
Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb. pt. 1. The location of central offices.--pt. 2. Construction of underground conduits.--pt. 3. The construction of cable plant.--pt. 4. The construction of aerial lines.--pt. 5. The substation.--pt. 6. Switchboards and the central office
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