with most of the aircraft being later sold to the Khmer Air Force. The Helio HST-550 Stallion was an STOL utility aircraft developed in the United States...

The Helio Aircraft Company was an American aircraft manufacturer founded in 1948. The Koppen-Bollinger Aircraft Corporation was founded by Otto Koppen...

S2CID 119194526. Thomas, P. C.; et al. (1997). "Vesta: Spin Pole, Size, and Shape from HST Images". Icarus. 128 (1): 88–94. Bibcode:1997Icar..128...88T. doi:10.1006/icar...

of Hidden Surface Removal (HSR) and Hierarchical Scheduling Technology (HST). As the polygon generating program feeds triangles to the PowerVR (driver)...