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Frenchy, how do you find these photos?
I'm just a patient guy, and Google is my friend

. I must say I don't know if the French Army used Ingersoll-Rand compressors. All I know is that Ingersoll-Rand products were regularly imported in France in the 30's... Maybe you could opt for some "artistic licence"

Talking about I-R compressors, heres' a smaller 1928 model :
I've also found a French (?) 1932 Attila C24 compressor that would look OK as well ...
HTH
Frenchy