Might I point out that before Boeing got in on the act, the Bristol Aircraft Corporation developed a twin-rotor aircraft that first flew in 1952 and was developed into an operational type that was flown by the RAF in the 1960s. Details here:
http://en.wikipedia.org/wiki/Bristol_Belvedere
Also, StbdD, I read VertolNut's post as entirely compatible with what you said. He said the aircraft was a
Kawasaki Vertol 107, then went on to point out that the original 107 predated the Phrog. Or am I wrong?