I thin he told me the big green one was a 1950 that he got in Missouri, and the smaller one was a 1913. Not sure where he got that. The green one ran about $10,000.00.
As well, they were both steam machines, re-ported for air.
It takes a big Sulair deisel compressor - another 5 grand - and a 2000 gallon propane tank used as an air bladder between the compressor and the hammers.
Quite a set up.
They are available if you look around in industrial steel manufacturing equipment.