A shutter driving actuator for driving a shutter from {HEAD ~ the closed position} to the opened position when in {TAIL ~ operation} is connected to the shutter 
A shutter driving actuator for driving a shutter from { HEAD ~ the closed position } to the opened position when in { TAIL ~ operation } is connected to the shutter
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH