High Quality Content by WIKIPEDIA articles! The Maschinengewehr Patent Schwarzlose M.07/12 (Known as the O` seven twelve) was a medium machine-gun, and was used as a standard issue firearm in the Austro-Hungarian Army throughout World War I. It was also used by the Dutch, Greek and Hungarian armies during World War II. It was also routinely issued to Italian colonial troops, alongside the Steyr-Mannlicher M1895 rifle.