The last picture on this article.
http://www.bratishka.ru/archiv/2010/5/2010_5_10.php (http://www.bratishka.ru/archiv/2010/5/2010_5_10.php)
(http://i620.photobucket.com/albums/tt283/Rotedria/1334803974644.jpg)
Ran the text through Google Translate, I'm learning to speak and listen Russian, not read it.
quad tank machine gun Degtyarev (DTM-4). Prototype in 1939
Combat use of armored machine gun DT during the Great Patriotic War, also revealed some of their shortcomings, both constructive and productive. In the CB-2 Degtyarev repeated attempts to improve the DT machine gun. And only when the overall modernization of the DP machine gun, held by VA Degtyarev in 1944, an opportunity to make corrections in his tank option. Just as in the DP, back-transferred from the mainspring barrel to the trigger frame, eliminating overheating. The changes were made and the design of mounting the piston guide tube, allowing the arrow to disassemble the weapon without removing it from the installation of ball. To reduce the production of many parts, including stock, steel manufacturing by stamping. The modified tank machine gun Degtyarev (DTM) was also adopted for the Red Army, October 14, 1944. His production has been established only Kovrov plant.
Great Patriotic War the Red Army infantry finished, being armed with light machine guns modern design is not only not inferior, but by some measures superior to similar foreign systems. The result is truly heroic efforts of the Soviet designers, engineers and workers were translated during the war, production of machine guns on the application of advanced technologies and extensive use of stamping and welding.
After the war, machine gun Degtyarev got a second life by allowing these weapons for at least another 20 years to remain in the ranks.