This Day in Aviation History
March 3rd, 1953
First flight of the Bell HSL.

The Bell HSL (Model 61) was an American 1950s anti-submarine warfare (ASW) helicopter built by Bell Helicopter company, the only tandem rotor type designed by Bell….

Source:
Wikipedia, Bell HSL:  http://en.wikipedia.org/wiki/Bell_HSL
Bell Helicopter 
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