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  2. 20 mm caliber - Wikipedia

    en.wikipedia.org/wiki/20_mm_caliber

    20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called " guns ", from larger-caliber " cannons " (e.g. machine gun vs. autocannon ), is conventionally taken to be the 20 mm round, the smallest caliber of autocannon.

  3. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    17.9 mm 2.5 g 1796–1964 $2.50 Gold Quarter Eagle 18 mm 4.2 g 1796–1929 Small Cent 19.05 mm 2.5 g 1943 Small Cent 19.05 mm 3.11 g 1864-1982 Small Cent 19.05 mm 4.67 g 1856-1864 2.5 g 1982–present Three Dollar 20.5 mm 5.01 g 1853–1876 Nickel 21.21 mm 5 g 1866–present Nickel 21.21 mm 5 g 1942–1945 Twenty Cent 22 mm 5 g 1875–1878 $5 ...

  4. Oerlikon 20 mm cannon - Wikipedia

    en.wikipedia.org/wiki/Oerlikon_20_mm_cannon

    The Oerlikon 20 mm cannon is a series of autocannons based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II .

  5. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.The microwave is between 1 meter to 1 millimeter.. The millimetre (international spelling; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length.

  6. List of naval guns by caliber - Wikipedia

    en.wikipedia.org/wiki/List_of_naval_guns_by_caliber

    Madsen 20 mm cannon Denmark: World War II 20 mm (0.79 in) 20 mm Oerlikon Switzerland: World War II - Cold War 20 mm (0.79 in) 20 mm Polsten Poland: World War II - Cold War 20 mm (0.79 in) 2 cm/65 C/30 Nazi Germany: World War II 20 mm (0.79 in) 20 mm akan m/40 (Bofors 20 mm automatic gun L/70 model 1940) Sweden: World War II - Cold War 20 mm (0. ...

  7. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    Original nominal 25 mm figure scale; though a 6-foot human in 1:87 is closer to 21 mm. 1:82: 3.717 mm An intermediate scale (HO/OO) intended to apply to both HO and OO scale train sets. Also used for some military models 1:80: 3.810 mm HOj scale. Very close to wargaming 20 mm figure scale (20 mm is actually 1:80.5). [10] 1:76.2: 4 mm: Model ...

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  9. MG FF cannon - Wikipedia

    en.wikipedia.org/wiki/MG_FF_cannon

    The MG FF was a drum-fed, blowback-operated, 20 mm aircraft autocannon, developed in 1936 by Ikaria Werke Berlin of Germany. It was a derivative of the Swiss Oerlikon FF F cannon (its FF suffix indicating Flügel Fest, for a fixed-mount, wing location from the Swiss original), with the Oerlikon FF design itself a development of the Imperial German World War I Becker 20 mm cannon, and was ...