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https://oukosher.org/blog/news/setting-the-record-straight-on-kosher-slaughter/
This says they don’t, it’s not gospel but, it’s one of the first results.
Not fighting, I just looked more into it because I am that special kind of crazy
I look that sort of stuff up myself.
Now I’m not finding a source for the guillotine machine… I’ve seen one in person, and it had a spinning disc blade, because there are Jewish dietary laws that say you can’t press the blade into the neck, it must be a slice.
It might also have been a case of an enterprising butcher being inventive and sidestepping the rules…