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				Originally posted by Richard Farrant  
Hi Derek, 
 
I think that is the Scorpion IV flail, used by British in N. Africa. The Scorpion III, apparantly used power from the main engine and the MkIV had a separate power unit, which would appear to be like the one in your photo.  
 
For more pics and some details, check out this link; 
www.afrikakorps.org/grantscorpion.htm 
			
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      Thanks for the info and link Richard, that web site has some great pics of M3 Flails.  A man could make a career out of studying all the various models, both operational and prototype of mine clearing vehicles used in WW II.  During an internet search I came upon this picture of a Sherman prototype tank that experimented with spigot mortars mounted on the front for clearing mine fields.  I'll upload it for your perusal.