Nissan started with their H-series, and later the L-series (up until 1986) of the early Nissan Z-cars, also known as Fairlady Zs, as well as the RB engine series engines (in the R31-R34 Skyline). They also made the P-series and TB-series straight six, of which the latter is still currently made and is fitted inside the Patrol/Safari. Nissan also benefited from acquisition of previous manufacturers called Prince Motor Company who manufactured a six cylinder called the Prince G engine, and Tokyu Kogyo Kurogane who helped develop Nissan's current engines.