Encyclopedia : C : CH : CH2 (9 articles)

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CH-21 Shawnee
USAF CH-21B at the National Museum of the United States Air Force Shawnees in formation over South Vietnam in 1962 A Shawnee over rice paddies in Vietnam The H-21 Shawnee was the fourth of a line of tandem rotor helicopters designed and built by Piasecki (later Boeing Vertol). Com..
CH2M Hill
CH2M HILL is a US engineering, consulting, construction, and operations firm. The company was founded after World War II (in 1946) by an Oregon State University professor (Merryfield) and three students (Cornell, Hayes, and Howland). The firm - originally based in Corvallis, Oregon and named after..

 

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