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  2. Kellogg Switchboard and Supply Company - Wikipedia

    en.wikipedia.org/wiki/Kellogg_Switchboard_and...

    Kellogg company logo as used from the 1920s to the 1950s. The Kellogg Switchboard and Supply Company was an American manufacturer of telecommunication equipment. Anticipating the expiration of the earliest, fundamental Bell System patents, Milo G. Kellogg, an electrical engineer, founded the company in 1897 in Chicago to produce telephone exchange equipment and telephone apparatus.

  3. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    1924 PBX switchboard. With manual service, the customer lifts the receiver off-hook and asks the operator to connect the call to a requested number. Provided that the number is in the same central office, and located on the operator's switchboard, the operator connects the call by plugging the ringing cord into the jack corresponding to the ...

  4. Panel switch - Wikipedia

    en.wikipedia.org/wiki/Panel_switch

    Panel switch district selector frame at the Connections Museum in Seattle. The Panel Machine Switching System is a type of automatic telephone exchange for urban service that was used in the Bell System in the United States for seven decades.

  5. Telephone switchboard - Wikipedia

    en.wikipedia.org/wiki/Telephone_switchboard

    PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.

  6. The Milwaukee County Zoo is replacing the zoo train's steam ...

    www.aol.com/milwaukee-county-zoo-replacing-zoo...

    The No. 1916 engine is leaving the zoo April 1, and the No. 1924 engine will leave Oct. 31. The train will continue to use its two diesel engines and is buying two custom-built diesel engines to ...

  7. Extension (telephone) - Wikipedia

    en.wikipedia.org/wiki/Extension_(telephone)

    In business telephony, a telephone extension may refer to a phone on an internal telephone line attached to a private branch exchange (PBX) or Centrex system. The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a ...

  8. Switchboard operator - Wikipedia

    en.wikipedia.org/wiki/Switchboard_operator

    Switchboard technology was a physically demanding task, involving numerous plugs, keys, lights, connecting cords, and complicated protocols for establishing connections. The full-time operators were on duty 56 hours per week, and while they often grumbled about being overworked by a harsh boss, they were reasonably compensated at $50 a month.

  9. Nortel Meridian - Wikipedia

    en.wikipedia.org/wiki/Nortel_Meridian

    It was introduced by Northern Telecom in December 1974 at the USITA convention in San Francisco, with an original capacity from 100 to 7,600 lines, and became the first fully digital PBX announced on the global market aimed at the smaller PBX market. In the early 1970s, most PBXs were either electromechanical (e.g. cross-bar) or based on a ...