Reference for Chullin 30:41

השוחט במוכני שחיטתו כשרה במחובר לקרקע שחיטתו כשרה

Whence do you know that a distinction is to be drawn between that which was always attached and that which was first loose and subsequently attached? - From the following [Baraitha] which was taught: If one slaughtered with a wheel,<span class="x" onmousemove="('comment',' A knife was fixed to the wheel so that it cut the throat of the animal whilst the wheel revolved.');">²³</span>

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