Telephone; a manual of the design, construction, and operation of telephone exchanges .. pt. 5
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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