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