Does anybody remember mobile engine overhaul outfits?
I don't think we had any around here, and I'm 69. I DO remember one old independent mech in town in a little bitty garage, had a carbide acetylene generator for his cutting torch. Now, THAT thing was impressive!!!
For those unaware, these are how miner's lamps and early automotive lighting worked. An upper water tank drips water onto carbide, which makes acetylene gas