According to Goeffrey Futter's book, the Log carpet device posted by Hanno and repeated by Mark was "developed by F wing of 79th Armoured Division at Gheel in Belgium during late 1944". However I am aware that some of the AVRE attachments shown in the book have since been shown to be proposals or experimental.
But this was not the same device as used on D Day. I have just searched my hard drive for the following which was sent to me by a friend - it is from the National Archives and is from a document entitled "Assault Royal Engineers - Equipment and training - may 1944. I am pretty sure that this is what a D Day log carpet looked like. I understand that there were some other devices in the document which were not used on D Day - such as a chespale carpet mounted in a similar way to the log carpet shown below
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