ROBINSON ( U.S.A. )
Robinson Model R.22 Robinson Model R.44
ROTORCRAFT / CIERVA ( GREAT BRITAIN )
Rotorcraft / Cierva CR.LTH-1 "Grasshopper" Rotorcraft / Cierva "Grasshopper" Rotorcraft / Cierva W.9 Rotorcraft / Cierva W.11