Over many years - but not fifty years - we bought and sold small steam engines at antique shows and flea markets. A family dentist - a very poor one - was a hobbyist who perhaps should have stuck with building steam engines rather than hurting people.
Not a single one - the steam engines, not the dentist - was built using refrigerator compressors or was a modern rankine cycle engine.
I am happy to discuss steam engines or rankine cycle engines but it is helpful not to confuse the two.
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