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!!!

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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

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Knew a guy who had an acetylene generator in his body shop. One night, after several beers, we launched several large balloons filled with the gas with a lighted fuse attached... the balloons would ignite at about 500'.

The problem was his shop was in the flight path for the local airport... oops! After a stern warning form the local cops, FBI and FAA he sold the generator.