Sirkkeli

http://ronin-group.org/shop_circular_saw_history.html

"There is an oft-quoted assertion that the circular saw blade was invented in 1813 by Shaker Sister Tabitha Babbitt (1784–1854). This is most often cited by Shaker “historians”, aficionados-of or workers-in that design idiom, or by other parties who are simply parroting the aforementioned mentioned sources. However, there is nothing in the historical record to document this claim, and considering the existence of the Miller patent some thirty-six years before, and various authoritative and credible sources on the history of woodworking technology describing systems in use more than a century before that, this claim is unsubstantiated and without basis in fact."

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