Igor Sikorsky defines the crane helicopters -- S-60 experimental crane proves the concept -- Development of the S-64 production skycrane -- West German military verifies S-64 performance -- Development of Army crane and Vietnam success -- Sikorsky develops commercial markets -- Erikson expands market and buys all S-64 rights -- Future cranes.
Electronic reproduction. Ann Arbor, MI : ProQuest, 2015. Available via World Wide Web. Access may be limited to ProQuest affiliated libraries