{HEAD ~ The mirror} also independently pivots under {TAIL ~ the bias} of a spring about the mirror pivot axis to an erected operative position wherein its upper and lower parallel edges are disposed perpendicular to the optical axis of the lens 
independently pivots under
{ HEAD ~ The mirror } also independently pivots under { TAIL ~ the bias } of a spring about the mirror pivot axis to an erected operative position wherein its upper and lower parallel edges are disposed perpendicular to the optical axis of the lens
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH