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2. GPO telephones - Wikipedia

   en.wikipedia.org/wiki/GPO_telephones

   The Relate is shown on the left, the React has a squarer styling, without the pen-holder tray. On the underside of the Relate there is a mount that can be fitted in two positions. One makes it a desk telephone and mounting it the other way round turns it into a wall telephone – very ingenious.

3. Modular connector - Wikipedia

   en.wikipedia.org/wiki/Modular_connector

   The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]

4. Electrical wiring - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring

   In Austria, wires were concealed by embedding a rubber tube in a groove in the wall, plastering over it, then removing the tube and pulling wires through the cavity. [ 15 ] Metal moulding systems, with a flattened oval section consisting of a base strip and a snap-on cap channel, were more costly than open wiring or wooden moulding, but could ...

5. AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets

   The Thai dual socket is specified in figure 4 of TIS 166-2549 and is designed to accept Thai plugs, and also Type A, B, and C plugs. Chinese dual sockets have both an unearthed socket complying with figure 5 of GB 1002-2008 (both flat pin and 4.8 mm round pin), and an earthed socket complying with figure 4 of GB 1002-2008.

6. NEMA connector - Wikipedia

   en.wikipedia.org/wiki/NEMA_connector

   The same patent had a second design, with a wall attachable receptacle, capable of receiving the same plug, thus being the first socket and plug design patented in the US. Later in 1904, he changed the design to flat blades (a design later incorporated in the NEMA 2 series), filled under the U.S. patent 774,251 Both these patents were granted ...

7. Electrical connector - Wikipedia

   en.wikipedia.org/wiki/Electrical_connector

   Most electrical connectors have a gender – i.e. the male component, called a plug, connects to the female component, or socket. Thousands of configurations of connectors are manufactured for power, data, and audiovisual applications. [3] Electrical connectors can be divided into four basic categories, differentiated by their function: [4]