The primary objective of {TAIL ~ the present invention} is to provide a bidirectional projector, which may project slides onto {HEAD ~ two screens} in the same time 
The primary objective of { TAIL ~ the present invention } is to provide a bidirectional projector , which may project slides onto { HEAD ~ two screens } in the same time
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH