And my small contribution
Taken directly from
Wikipedia
Sarah "Tabitha" Babbitt (December 9, 1779 – circa 1853) was an early American Shaker tool maker and inventor, including inventions for the circular saw, spinning wheel head and false teeth. It is contested whether she, or other Shakers, were the first to invent the circular saw. She was a member of the Harvard Shaker community.
Some of you, may already have know this .
Cheers Matt
More power to the ladies I say