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					Originally Posted by Tony Smith  And didn't we have a discussion on the subject of the name being Marsden/Marston, and PSP meaning Pierced/Perforated Steel Plate? Can't find that thread.    | 
	
  Tony,
  
 I think you were looking for this one: 
Sand channel, PSP, Marsden matting. I found a couple which I merged, just as I did with related threads in this section.
  
 HTH,
 Hanno