{HEAD ~ The apparatus} 1 wherein {TAIL ~ said ultrasonic beam generator} is translated transverse to the path of the trays and said opening is a transverse slot of sufficient width in the direction of tray movement to pass coupling fluid and said transversely moved ultrasound beam, but not to pass the small parts in the trays 
wherein
{ HEAD ~ The apparatus } 1 wherein { TAIL ~ said ultrasonic beam generator } is translated transverse to the path of the trays and said opening is a transverse slot of sufficient width in the direction of tray movement to pass coupling fluid and said transversely moved ultrasound beam , but not to pass the small parts in the trays
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH