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The Stirling Engine was invented by a Scottish minister named Robert Stirling in It runs on very little energy, using an ingenious inter-cylinder air-exchange principle.
Pendant | Chuck Domitrovich. 'Wedding Ring Holder'. Sterling silver with one brass ball bearing as an added kinetic element. This ring was a custom order by a doctor's wife who wanted that her husband had a secure place to keep his ring, when he went into surgery and had to scrub in.