Propane is a naturaly occuring gas in petroleum and during WW2 I would imagine everything petroleum related was converted to fuel for whatever. Thus the reason for hydrogen as a fuel gas. I'm not sure you can even get it from the welding supply. Just for ? I ask'em tomorrow.
The basic question of politics is "Who does what to Whom?". -Vlademir Lenin.
"Politicians are always interested in people.
Not that this is always a virtue.
Fleas are interested in dogs." -P.J.O'Rourke