Threshing as one of the 39 Melachot
include all operations where food
from its natural container, whether
The prime example is threshing grain to remove
it from its husk. But squeezing a fruit for its
juice is included, as well as milking a cow.
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Most of this information is taken
from the book "SABBATH Day of Eternity"
by Rabbi Aryeh Kaplan, published by NCSY.
In the book itself, there are notes that refer the
reader to detailed footnotes.
I am lucky to have found such a clear, concise manual
with these brief overviews of laws so vast and complex
there are Rabbis that specialize in them.