This invention relates to fluid reaction surfaces having resiliently mounted non rigid working members, more specifically to {HEAD ~ an improved two bladed rotor} for rotary wing aircraft, {TAIL ~ especially gyroplanes} 
for
This invention relates to fluid reaction surfaces having resiliently mounted non rigid working members , more specifically to { HEAD ~ an improved two bladed rotor } for rotary wing aircraft , { TAIL ~ especially gyroplanes }
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