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2. MC4 connector - Wikipedia

   en.wikipedia.org/wiki/MC4_connector

   The MC4 system consists of a plug and socket design. The metal contacts of the plugs and sockets are inside plastic insulators; the plug's metal contact is inside a cylindrical insulator that looks like a socket, and the socket metal contact is inside a square probe that appears as a plug.

3. IEC 60309 - Wikipedia

   en.wikipedia.org/wiki/IEC_60309

   IEC 60309 (formerly IEC 309 and CEE 17, also published by CENELEC as EN 60309) is a series of international standards from the International Electrotechnical Commission (IEC) for "plugs, socket-outlets and couplers for industrial purposes".

4. Twist-on wire connector - Wikipedia

   en.wikipedia.org/wiki/Twist-on_wire_connector

   In 1914, he produced a set-screw version, the forerunner of the present-day twist-on connector used throughout North America. Ceramic twist-on connectors from the beginning of the 20th century "Electric Wire Connecter" U.S. patent 1,583,479, Filed March 3, 1923, Patented May 4, 1926; Patent Drawing by W. P. MARR

5. Coupling (piping) - Wikipedia

   en.wikipedia.org/wiki/Coupling_(piping)

   Examples of adapters include one end BSP threaded with the other NPT threaded, and one end threaded with the other a plain socket for brazing. A coupling whose ends use the same connection method but are of different sizes is called a reducing coupling or reducer. An example is a 3/4" NPT to 1/2" NPT coupling.

6. Trailer connectors in Europe - Wikipedia

   en.wikipedia.org/wiki/Trailer_connectors_in_Europe

   Multicon [1] Feder and Multicon WeSt (Welt Standard) connectors are precursors to ISO 11446 in a design that is intended to be compatible with ISO 1724.This means that if a towing vehicle has an outlet of this type it should be able to connect a trailer with a standard 7-pin or 5-pin connector according to ISO 1724, provided that the trailer coupling follows the standard and that the trailer ...

7. Railway coupling - Wikipedia

   en.wikipedia.org/wiki/Railway_coupling

   An animation of the SA-3 coupler Willison coupler on South African 2 ft (610 mm) narrow gauge. The Willison coupler was developed in the US in 1916 to address issues present in the Janney coupling. [25] The Russian SA3 coupler works according to the same principles as the AAR coupler, but the two types are incompatible. [26]