Bert 1, that pic you have shown of the anti personell mine is the "butterfly Bomb", They are meant to be un-defusable, I have a fragment of the same that was blown up by bomb disposal years ago, the guy had it as a souvenir on his mantle piece!!! He had watched an episode of Danger UXB and they mentioned that it could not be deactivated, so he phoned the bomb desposal, who came round immediatly! The guy had then carried it to the bottom of his garden where the crew said that if it was still on the mantle piece thats where they would have blown it!!! The fragment id the fuse cover plate, complete with fuse type, type 41, year of manufacture, 1941 and factory marks!! All very clearly stamped into the plate, about the size of a can lid!
Jeez. One lucky guy there! The Type 41 was designed to go off on impact I think. (Must dig the book out). Another type went off after a set time and a third type armed itself when it hit the deck and then would go off if moved about 2mm (not a lot).
Kids picked them up after a raid. The curious gave them a tap with their foot. Some landed in fields only to give a blundering cow/sheep a bad time!
Recall reading that if anything went tits up when defusing a bomb, you wouldn't know the slightest thing. The train of detonation, the gaine going off and the main charge going pop is far quicker than the fastest nerve transmission in the human body. Not even time to think "Oh sh*t" !! Maybe just as well.