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2. QF 3-inch 20 cwt - Wikipedia

   en.wikipedia.org/wiki/QF_3-inch_20_cwt

   The 3-inch 20 cwt gun was superseded by the QF 3.7-inch (94 mm) AA gun from 1938 onwards, but numbers of various Marks remained in service throughout World War II. In Naval use it was being replaced in the 1920s by the QF 4-inch (100 mm) Mk V on HA (high-angle) mounting.

3. List of specialist Churchill tank variants - Wikipedia

   en.wikipedia.org/wiki/List_of_specialist...

   The QF 3-inch 20 cwt anti-aircraft gun had been replaced by the 3.7-inch gun so these were selected and Vauxhall was provided with 100 guns and given the task of producing the vehicle. The design used a fixed square thick plate superstructure with the gun in a ball mount low in the front next to the driver.

4. HMS Tiger (1913) - Wikipedia

   en.wikipedia.org/wiki/HMS_Tiger_(1913)

   The ship mounted a pair of QF 3 inch 20 cwt [Note 1] Mk I anti-aircraft guns on high-angle Mark II mounts. [17] The gun had a maximum elevation of +90° and fired a 12.5-pound (5.7 kg) shell at a muzzle velocity of 2,604 ft/s (794 m/s). It had a maximum effective ceiling of 23,000 ft (7,000 m). [19]

5. HMS Bellona (1909) - Wikipedia

   en.wikipedia.org/wiki/HMS_Bellona_(1909)

   Her secondary armament consisted of four quick-firing (QF) 3-pounder (47-millimetre (1.9 in)) Vickers Mk I guns and two submerged 21-inch (533 mm) torpedo tubes. During the war, four additional four-inch guns were added amidships to increase her firepower. A QF three-inch (76 mm) 20-cwt [Note 1] anti-aircraft gun was also added. In 1918 it was ...

6. List of naval anti-aircraft guns - Wikipedia

   en.wikipedia.org/wiki/List_of_naval_anti...

   QF 3 inch 20 cwt United Kingdom: World War I: 76.2 3"/23 caliber gun United States: World War I - 1920s 76.2 1 or 2 3"/50 caliber gun United States: World War I - World War II - Cold War: 76.2 2 3"/70 Mark 26 gun United States United Kingdom: Cold War: 100 2 10 cm/65 Type 98 naval gun Empire of Japan: World War II: 102 QF 4 inch Mk V naval gun ...

7. Courageous-class battlecruiser - Wikipedia

   en.wikipedia.org/wiki/Courageous-class_battlecruiser

   Each ship mounted a pair of QF 3 inch 20 cwt [Note 1] anti-aircraft guns on single high-angle Mark II mountings. These were mounted abreast the mainmast in the Courageous-class ships and before the funnel on Furious. [7] The gun had a maximum depression of 10° and a maximum elevation of 90°.