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