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If you are talking about internal combustion engines I would imagine the Wankle or "rotary" engine, as it has the fewest number of moving parts and keeps a consistent direction of movement. However all engines rely on the maintenance they receive and the work load/conditions they endure. I have heard of some steam engines that operated for 70 some odd years continually in factories, and electric motors I could see running for as long as they were supplied power.
What else can I help you with?
What Is the longest lasting light bulb in Mississippi?
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Which of the early dynasties is china's longest and which is shortest?
The shortest Chinese dynasty was the Xin Dynasty, lasting 14 years. The longest lasting one was the Shang Dynasty, lasting 571 years.
Which of the early dynasties is China's longest and which is the shortest?
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