{HEAD ~ The invention} contemplates {TAIL ~ a precisely adjustable threaded mechanism}, as for focus adjustment of an aerial camera lens, wherein inner and outer threaded members are normally in circumferentially continuous radially stressed play free engagement to the extent of requiring a characteristic maximum torque for their rotary adjustment 
contemplates
{ HEAD ~ The invention } contemplates { TAIL ~ a precisely adjustable threaded mechanism } , as for focus adjustment of an aerial camera lens , wherein inner and outer threaded members are normally in circumferentially continuous radially stressed play free engagement to the extent of requiring a characteristic maximum torque for their rotary adjustment
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