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A comment on Drone Bubble Bursts, Wiping Out Startups and Hammering VC Firms. Parent comment
However "reciprocating engine" has a clear usage preponderance over "reciprocating motor":
https://books.google.com/ngrams/graph?content=reciprocating%...
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However "reciprocating engine" has a clear usage preponderance over "reciprocating motor":
https://books.google.com/ngrams/graph?content=reciprocating%...