Um, Perry, it was a shop explosion, not the Allied assualt on Anzio.
Groten does embed this gem at the bottom:
While the blast destroyed the brick building, firefighters say equipment inside can be salvaged [Perry Groten, "Explosion Destroys Rapid City Business," KELOLand.com, 2009.03.14].
Whatever that equipment was, I want some! Call the manufacturer—there's an ad here!
Rapid City Journal is on the scene with more details here—still no mention of who built the bomb-proof tool kits.