My father, a mechanic, told me a story that happened, thinking 40-50s, about a guy who invented an engine that ran off of compressed air. He said one of the big auto companies or gas companies, can't remember, bought it and the rights to it, not sure if it was patented, anyway, the agreement was he was not to ever share nor make it ever again. of course they hid the plans away... sorry I was a kid when he shared this with me, didn't really understand back then what it really meant.
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