OK, so gas welding? I've not ever welded but I thought there were some welding methods that used gas. Maybe not
Gas welding doesn't use any electricity at the point of use, but pretty much the entire gas welding system is made/manufactured using electric...
Looking at that cart, pretty much the entire thing was made using modern electric based manufacturing techniques... So it becomes a game of semantics where they can't be the one using the electricity but they can use the product made from electricity by anothers hands...