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2. Panel switch - Wikipedia

   en.wikipedia.org/wiki/Panel_switch

   Call switching by panel switch at the Seattle Museum of Communications. Archive Footage of early panel system. Survey of telephone switching; Phone Trips: 1970s-era recordings of telephone calls involving panel switches by Evan Doorbell. MP3 recording of revertive pulsing, followed by machine ringing and the clicks of the Panel test line.

3. Electric switchboard - Wikipedia

   en.wikipedia.org/wiki/Electric_switchboard

   It is an assembly of one or more panels, each of which contains switching devices for the protection and control of circuits fed from the switchboard. Several manufacturers make switchboards used in industry, commercial buildings, telecommunication facilities, oil and gas plants, data centers, health care, and other buildings, and onboard large ...

4. Electrical wiring - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring

   A somewhat similar system called "concentric wiring" was introduced in the United States around 1905. In this system, an insulated electrical wire was wrapped with copper tape which was then soldered, forming the grounded (return) conductor of the wiring system. The bare metal sheath, at earth potential, was considered safe to touch.

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6. DMS-100 - Wikipedia

   en.wikipedia.org/wiki/DMS-100

   The DMS-100 is a member of the Digital Multiplex System (DMS) product line of telephone exchange switches manufactured by Northern Telecom. Designed during the 1970s and released in 1979, it can control 100,000 telephone lines. [1] The purpose of the DMS-100 Switch is to provide local service and connections to the PSTN public

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8. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   The toggle light switch was invented in 1916 by William J. Newton. [2] As a component of an electrical wiring or home wiring system, the installation of light switches is regulated by some authority concerned with safety and standards. In different countries the standard dimensions of the wall mounting hardware (boxes, plates, etc.) may differ.

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