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The Lion chuck was made after 1935 because it has the star-shaped opening to accommodate large bits, according to Randy Roeder's fine webpage.
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I tried to show the three patent dates, June 25, 1907, February 16, 1909, and November 8, 1910, that were stamped on the shell of the Lion chuck, but even displayed as a negative image, they are still mostly illegible.
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