File:Practical Treatise on Milling and Milling Machines p199.png

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English: Cutting a Spiral with End Mill
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Source https://en.wikisource.org/wiki/Page:Practical_Treatise_on_Milling_and_Milling_Machines.djvu/205
Author Brown & Sharpe Mfg. Co.

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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Practical_Treatise_on_Milling_and_Milling_Machines_p199.png

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