The apparatus 1 wherein said ultrasonic beam generator is translated transverse to the path of {TAIL ~ the trays} and said opening is a transverse slot of {HEAD ~ 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 
The apparatus 1 wherein said ultrasonic beam generator is translated transverse to the path of { TAIL ~ the trays } and said opening is a transverse slot of { HEAD ~ 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
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