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The Mark IV (pronounced Mark four) was a British tank of the First World War. Introduced in 1917, it benefited from significant developments of the Mark I tank (the intervening designs being small batches used for training). The main improvements were in armour, the re-siting of the fuel tank and ease of transport.
A Mark IV Female, Grit, is stored at the Australian War Memorial. It was on display in ANZAC Hall at the Australian War Memorial until August 2008. It is now kept at their bulk store in Mitchell, Canberra. [48] In 1999, a Mark IV Female, D51: Deborah, was excavated at the village of Flesquières in France.
Canon EOS-1D Mark IV, a digital SLR; AI Mark IV radar, the first air-to-air radar; Navy Mark IV (late 1950s–early 1960s), a full pressure suit designed for unpressurized military jets; Vickers Tank Periscope MK.IV (1936), designed in Poland; Mk IV Turtle helmet (1950s–1980s), British Army helmet, a slight design change from the Mk III ...
In British military practice, Mark ("Mk") designations were given in Roman numerals (replaced by Arabic numerals in 1944) to reflect variants of or production changes to service weaponry, either on their own or as part of numerical ("No.") designations; in the Lee-Enfield rifle series for example, the SMLE rifles were produced to Mk I, Mk III, and Mk V specification (with the latter two later ...
Mark IV, now running on the 360, System/370 and RCA Spectra 70 as well as non-IBM-compatible systems, was the first software with sales of a million dollars a year, [1] and the first software product to have cumulative sales of $10 million, and then $100 million. [9] This change also started IBM's efforts to sell their own software.
With British systems already in widespread use, the decision was made to adopt Mark II and Mark III for US aircraft. [1] In 1942, the Combined Research Group began the development of a new system based on the basic Mark IV pattern but with a further increase in operational frequency to 1.03 GHz for the interrogation and 1.09 GHz for the responses.
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The Anti-Tank Mine, General Service, Mark IV (or Mk 4 mine) was a British anti-tank mine used during World War II. [1] [2] Externally the mine has a cylindrical main body filled with explosive either TNT or Baratol. The mine is covered by a pressure plate, which is attached to the mine body by four pins which sit in vertical slots in clips that ...