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I dug this up on the internet
Interesting.
HAENEL, C.G.
Previous firearms manufacturer located in Suhl, Germany 1840-1946.
The firm was originally established by Carl Gustav Haenel. Herbert Haenel, grandson of the firm's founder, ran the organization from his father's death in 1917 until the firm was taken over by government decree on July 24, 1946. After the second World War, Haenel was disowned without compensation by the so called "Thueringer Gesetz". At the same time the name of the company was stricken from the register and became a part of VEB Ernst-Thaelmann. The firm's old plant then operated under the name Ernst-Thaelmann-Werke VEB until Germany was re-united.
During 1840-WWII, C.G. Haenel manufactured a variety of sporting longarms, mostly concentrating on bolt action rifles, drillings, and SxS shotguns. The author would like to thank Mr. Dietrich Apel and the German Gun Collectors Association for providing the company history.

The "Sturmgewehr" - Haenel / Schmeisser MP 43 MP 44 Stg. 44 assault rifle Hugo Schmeisser led the Haenel development team, which produced the first working prototypes of new weapon by 1942, known as MKb.42(H).
December 1944 officially christened it the Sturmgewehr, or Assault Rifle, 1944 (StG.44) This was a pure act of propaganda, but the name stuck not only to that gun, but also to the whole new class of automatic weapons designed to fire intermediate cartridges.
I did not know that anyone ever actually mass produced a gun with a curved barrel This device had a special mirror sighting adapter and reduced the bullet velocity down to mere 300 meters per second due to the high friction in the curved barrel extension. This apparently did not bother the German Army, since these curved barrel adapters were intended for short-range encounters only.