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310 units were delivered to the Wehrmacht at the final stages of the war. However, introduction of infrared devices for small arms began in early 1944. Vampir gear was first used in combat in February 1945. The sensor operated in the upper infrared (light) spectrum rather than in the lower infrared (heat) spectrum and was, therefore, not sensitive to body heat. The searchlight consisted of a conventional tungsten light source shining through a filter permitting only infrared light. This was all strapped to a Tragegestell 39 (pack frame 1939). As well as the sight and infrared spotlight, there was a wooden-cased battery for the light weighing 13.5 kilograms (30 lb), and a second battery fitted inside a gas mask container to power the image converter. Haenel in Suhl, the weapons production facility. The ZG 1229 Vampir weighed 2.25 kilograms (5.0 lb) and was fitted with lugs on the StG 44 at C.G. The grenadier carrying this was known as a Nachtjäger (night-hunter). The system was heavy, with the device itself and a bulky battery backpack weighing 15 kilograms (33 lb) in total. Haenel, the Vampir was used in small numbers in the Eastern Front. The ZG 1229 Vampir 1229 ( ZG 1229), also known by its code name Vampir, was an active infrared device developed for the Wehrmacht for the Sturmgewehr 44 assault rifle during World War II, intended primarily for night use. The Zielgerät ZG 1229 Vampir displayed by a British soldier
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