If this is a racquet grenade and a racquet grenade was actually an
antipersonnel mine, the wide board makes sense. It would reduce the
killing radius on the "friendly" side.


Sounds reasonable, though I think I would prefer a thicker piece of wood if
it was meant to protect against shrapnel.

The rest of the answers have been posted, except for number 1498, which is
still unidentified:

http://answers264c.blogspot.com/


Rob