A screen apparatus for {HEAD ~ use} on {TAIL ~ a vibratory separator}, the screen apparatus for screening material introduced to the vibratory separator, the screen apparatus comprising 
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A screen apparatus for { HEAD ~ use } on { TAIL ~ a vibratory separator } , the screen apparatus for screening material introduced to the vibratory separator , the screen apparatus comprising
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH