I think I've found a bug, maybe.
Fulmination generators appear to be impossible to pick up once you've placed them, nothing seem to work when trying to remove them.
I've tried all the vanilla tools, the tinkerers construct tools, and all the wrenches too(tried shift-right click, right click, and trying to break with left-click), yet none of them worked.
So far, the only way I've successfully removed them(without going into creative mode) is via an anti-matter explosive(the block), which leaves an enormous crater, as expected.
For the record, yes, they can be broken while in creative mode.
This also happens to me in 1.3.9.
So, is this a bug, or is it actually working as intended?