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  2. Remington Model Four - Wikipedia

    en.wikipedia.org/wiki/Remington_Model_Four

    The Remington Model Four is a semi-automatic rifle manufactured by Remington Arms from 1981 to 1987. It features a gas-operated action with a gloss-finished walnut stock. Unlike most Remington rifles, the Model Four spells out the number and is marketed as the Model Four not the Model 4 .

  3. Flat-four engine - Wikipedia

    en.wikipedia.org/wiki/Flat-four_engine

    A flat-four engine, also known as a horizontally opposed-four engine or boxer engine, [1] is a four-cylinder piston engine with two banks of cylinders lying on opposite sides of a common crankshaft. The most common type of flat-four engine is the boxer-four engine , each pair of opposed pistons moves inwards and outwards at the same time.

  4. Flapper - Wikipedia

    en.wikipedia.org/wiki/Flapper

    The flapper lifestyle and look disappeared and the roaring '20s era of glitz and glamour came to an end in America after the Wall Street Crash of 1929. [105] Unable to afford the latest trends and lifestyle, the once-vibrant flapper women returned to their dropped hemlines, and the flapper dress disappeared.

  5. Nozzle and flapper - Wikipedia

    en.wikipedia.org/wiki/Nozzle_and_flapper

    The nozzle and flapper mechanism is a displacement type detector which converts mechanical movement into a pressure signal by covering the opening of a nozzle with a flat plate called the flapper. [1] This restricts fluid flow through the nozzle and generates a pressure signal.

  6. Ballcock - Wikipedia

    en.wikipedia.org/wiki/Ballcock

    When the handle of a flush toilet with a tank (British, cistern) is turned, a discharge mechanism is activated by means of a rod or chain. The mechanism may be a flapper valve, which is designed to sink more slowly than the water - allowing the water to exit to the toilet bowl below, so that the tank may empty.

  7. Swirl flap - Wikipedia

    en.wikipedia.org/wiki/Swirl_flap

    Swirl flap principle in a four-valve engine. A swirl flap is a small butterfly valve fitted to four-stroke internal combustion engines with at least two intake valves.It is installed inside or just before one of a cylinder's two intake ports, allowing to throttle its intake port's air flow, causing a swirl in the other intake port not fitted with a swirl flap.

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  9. Flapper locking - Wikipedia

    en.wikipedia.org/wiki/Flapper_locking

    Flapper locking is a type of locking mechanism used in self-loading firearms. It involves a pair of flappers on the sides of the bolt that each lock into an outwards ...