John, I realise there has been some time since you posted this. If you can
get hold of a copy of " Work of the RE in the European War 1914-19-
military mining" ,published by seceratary, Institution of Royal Engineers
chatham 1922 .You will find masses of info on equipment,techniques and
rescue etc along with photos of it and flimsies of mines and shelters all
over the western front. I have a copy and will look up any specific item if
you wish.pete
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