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  2. Three-prong adaptor - Wikipedia

    en.wikipedia.org/wiki/Three-prong_adaptor

    The flat parallel plug blades are polarized to prevent the hot and the neutral connections from being reversed. In addition, many versions have a molded obstruction bump on top of the adapter, to block the grounding prong and thus physically prevent forcible insertion of a 3-prong plug in the wrong orientation. [citation needed]

  3. Picatinny rail - Wikipedia

    en.wikipedia.org/wiki/Picatinny_rail

    Whereas the earlier Weaver rail is modified from a low, wide dovetail rail and has rounded slots, the 1913 rail has a more pronounced angular section and square-bottomed slots. This means that an accessory designed for a Weaver rail will fit onto a MIL-STD-1913 rail whereas the opposite might not be possible, unless the slots in the Weaver rail ...

  4. DC connector - Wikipedia

    en.wikipedia.org/wiki/DC_connector

    If the size is not known, it is difficult to distinguish by eye or measurement between the 2.1mm and 2.5mm ID plugs; some suppliers suggest simple methods. [ 1 ] Maximum current ratings commonly vary from unspecified up to 5 A (11 A for unique high-power versions from some companies [ 2 ] ), with 1 A, 2 A, and 5 A being common values. [ 3 ]

  5. AC power plugs and sockets - Wikipedia

    en.wikipedia.org/wiki/AC_power_plugs_and_sockets

    This is a round plug compatible with CEE 7/1, CEE 7/3, and CEE 7/5 sockets. It has two round pins measuring 4.8 by 19 mm (0.189 by 0.748 in). The pins are not sheathed, in contrast to e.g. CEE 7/16 Europlugs. It may be rated at either 10 A or 16 A. A typical use is for appliances that exceed the 2.5 A rating of CEE 7/16 Europlugs.

  6. Utility pole - Wikipedia

    en.wikipedia.org/wiki/Utility_pole

    The Stobie pole was invented in 1924 by James Cyril Stobie of the Adelaide Electric Supply Company and first used in South Terrace, Adelaide. [16] One of the early Bell System lines was the Washington DC–Norfolk line which was, for the most part, square-sawn tapered poles of yellow pine probably treated to refusal with creosote.

  7. Blank-firing adapter - Wikipedia

    en.wikipedia.org/wiki/Blank-firing_adapter

    Blank Firing Adapter attached to an M16 rifle/M203. BFAs for blowback and gas-operated firearms are relatively simple. These weapons depend on high pressures in the chamber generated by the combustion of the propellant to push the breech block to the rear, allowing another round to be chambered and fired. If a blank round is used, there is no ...