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2. Three-prong adaptor - Wikipedia

   en.wikipedia.org/wiki/Three-prong_adaptor

   Cheater plugs were previously available with a short flexible grounding wire rather than a flat metal screw tab. This allowed use of the lower receptacle in a duplex outlet, which does not have a faceplate screw in the correct location for the screw tab. The grounding wire would be diverted around the adapter to reach the faceplate screw above it.

3. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   bell adapters which are like mechanical joint adapters but contain a stainless steel backup ring to maintain a positive seal against the mating flange [9]: 347 flange adapters which attach to a polyethylene pipe with butt fusion to stiffen a junction and allow another flanged pipe or fitting to be bolted on [ 9 ] : 341

4. Twist-on wire connector - Wikipedia

   en.wikipedia.org/wiki/Twist-on_wire_connector

   Seeking a safer, more efficient connection method, Marr, working in his home workshop, developed the first pressure-type 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

5. AC power plugs and sockets - Wikipedia

   en.wikipedia.org/wiki/AC_power_plugs_and_sockets

   CEE 17 are a series of industrial grade (IP44) three-phase "pin & sleeve" connectors for industrial purposes, carpentry- and gardening appliances and also used as a weather-resistant connector for outdoor usage, like Caravans, Motorhomes, camper vans and tents for mains hook-up at camp-sites. [67] [68]

6. EmPower (aircraft power adapter) - Wikipedia

   en.wikipedia.org/wiki/EmPower_(aircraft_power...

   15-volt DC connector type found on many commercial airlines designed to provide power to travelers' electronic devices. The system is limited to 75 watts. [2] The use of a special connector is to prevent laptops charging at altitude and ensure that only approved adapters can be used.