The "Maschinengewehr" 30 is most notable as the design pattern that led to what is generally considered the world's first what?
MG 30: The "Maschinengewehr" 30, or MG 30 was a German-designed machine gun that saw some service with various armed forces in the 1930s. MG 30:  It is most notable as the design pattern that led to the MG 34 and MG 42, and thus is one of the major ancestors of many of the weapons in service which would later find widespread use into the 21st century. MG 34: The "Maschinengewehr" 34, or MG 34, is a German recoil-operated air-cooled machine gun, first tested in 1929, introduced in 1934, and issued to units in 1936. MG 34:  It accepts the 7.92×57mm Mauser cartridge, and is generally considered the world's first general-purpose machine gun.
general-purpose machine gun