You are dead right there and I am wrong about in-field oxygen generation plants, but as you say, at that time they were extremely large.
The Italian trailer still has me tossed. The thing I find interesting is the strange rack. Looks like a bank of fittings or taps?
On a good look the fairly small engine seems to be driving a compressor as it is a big square arrangement unlike generators which tend to be round and smaller than the engine. The radiator seems hugely excessive for such a small engine, maybe it had a water-cooled compressor? If you look closely it could be a radiator at each end - one for the engine and one for the compressor?
Lang
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