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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.
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 ...
Light Tank Mk IV. The Mark IV saw use in training, and weighed about five tonnes. These models had crews of two and were armed with Vickers machine guns. The idler wheels were removed, with the bogie wheels being respaced. [10] The design once again used a Meadows built engine this time rated for 90 HP. [11] 29 of the Mk IV A version are sent ...
A similar "helm-free" Mark VI* model with a range and bearing clock and fixed dial plate permitted a gyrocompass input to automatically track own ship as it altered course, and was the one incorporated in the Dreyer Fire Control Table Mark III and III*. [4] Such equipment was quite specialized to a larger fire control context.
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The QF 4-inch gun Mk IV [note 1] was the main gun on most Royal Navy and British Empire destroyers in World War I. It was introduced in 1911 as a faster-loading light gun successor to the BL 4 inch Mk VIII gun. Of the 1,141 produced, 939 were still available in 1939. [1] Mk XII and Mk XXII variants armed many British interwar and World War II ...