The lockwork mechanism is unique and interesting. The magazine well, providing a smooth, even trigger release. It has a stirrup-shaped connector bar that runs on either side of Like most 6.35 mm pistols, the WTP is an unlocked breech design. Until the advent of the WTP II, the gun was just called the WTP. , there were almost certainly patents filed in 1917 or 1918. But if there were completed prototypes in 1917 Neither of these two early prototypes features the cocking indicator which was patented in 1922. The guns illustrated in these patents are similar in outline to the unserialled prototype shown on page 147 of Mauser Pistolen and the serial number 1 prototype shown on page 148, whichįortuitously has the date 1917 engraved on the slide. The patent describes it as effectively a loaded chamber indicator. German patent 370907, filed 9 June 1922 and granted 25 August 1923, which covers the cocking indicator mechanism of the WTP.There should be a German patent corresponding to this Austrian patent, but we have been unable to locate it. Austrian patent 93959, filed and granted 8 March 1923, which covers the disconnector mechanism, but contains a patent drawing which shows the entire mechanism of.After extensive searching we have found only two patents for the WTP. They mean in Germany-but we have been unable to locate a German patent for this year either. Klaus-Peter König and Martin Hugo, in their book Taschen Pistolen, state that the WTP was patented in 1918-we assume We would be grateful to anyone who can locate this patent. We have been unable to locate the patent for barrel retention, possibly because it is not under the Heinzelmann name (Weaver, Speed, and Schmid state it was patented by a company owned by Mauser’s need to fulfill military contracts during World War II. It appears to have been discontinued before the end of 1940 due to Most sources state that the WTP II was first made in 1938, though the 1937 Geco catalogue already has it listed. There are two distinct types of WTP, known as the WTP I and the WTP II. WTP is the abbreviation for Westentaschenpistole, or vest pocket pistol. Mauser Pistolen is the only source that references Heinzelmann in relation to the WTP. The patents for the Heim pistol were filed in 1924 and granted in 1926, but none bears any relationship to the Mauser WTP. It carries the company’s name on the slide and appears to have been made for a short time in the early 1930s.” The Heim pistol does not use the same barrel removal system as the Mauser WTP. “Heinzelmann made the Heim pistol, a 6.35mm blowback automatic that externally resembles the Mauser WTP, but internally, is closer to the Browning 1910 with a fixed barrel and a coaxial return spring secured by a muzzle bushing. Weaver, Speed, and Schmid, in their book Mauser Pistolen, state: “Instead of designing a new pistol, Mauser simply bought the rights to an existing simple blowback design, with aīarrel removal system patented in 1917 by a company owned by a C E Heinzelmann of nearby Plochingen am Neckar.” They reference Hogg and Walter’s Pistols of the World, which states: (known as vest pocket pistols) and, as the end of World War I drew near, the Mauser company decided it was time they manufactured one. The Mauser Model 1910 in 6.35 mm Browning was by any measure a remarkably successful pistol, but the 6.35 mm Browning cartridge was originally designed for the smallest of personal protection pistols
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