The focal plane shutter is classified into {HEAD ~ two major groups}, {TAIL ~ i.e., a horizontally running screen type focal plane shutter}, and a vertically running blade type focal plane shutter 
The focal plane shutter is classified into { HEAD ~ two major groups } , { TAIL ~ i.e. , a horizontally running screen type focal plane shutter } , and a vertically running blade type focal plane shutter
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH