{HEAD ~ The invention} 1, wherein said magnetostrictive element is a wire, said sender means is fixed relative to {TAIL ~ the camera} and said sensor means is carried by said camera member and is adapted to be displaced along said wire in response to movement of said member 
{ HEAD ~ The invention } 1 , wherein said magnetostrictive element is a wire , said sender means is fixed relative to { TAIL ~ the camera } and said sensor means is carried by said camera member and is adapted to be displaced along said wire in response to movement of said member
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