Quote:
Originally Posted by HarryT
...You're either allowed to use machinery or you aren't. ...
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Harry, you're neglecting a third possibility: you're not allowed to control/operate it, but you may make use of it if it's already running. A classic example is fire. We're not allowed to light a fire on the sabbath (see e.g. Ex. 35:3), but we can certainly use the light of a candle that was lit before the sabbath started.