The compressed substrate boat comprises {TAIL ~ a stationary substrate boat} and {HEAD ~ a movable substrate boat}, each may be loaded/unloaded independently 
The compressed substrate boat comprises { TAIL ~ a stationary substrate boat } and { HEAD ~ a movable substrate boat } , each may be loaded / unloaded independently
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH