Comments by "xia en Gao" (@gaoxiaen1) on "Veritasium" channel.

  1. Singer also manfactured handguns during WWII, the M1911A1, .45 ACP auto.
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  2. I got a free book about this from the some US government agency in the early 1980s. It was interesting, but I was thinking along ways of using heat/cold for an engine rather than the reverse, using the mechanical aspect as a cooler or heater.
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