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  1. en.wikipedia.org › wiki › Helen_JacobsHelen Jacobs - Wikipedia

    Helen Hull Jacobs (August 6, 1908 – June 2, 1997) was an American tennis player who won nine Grand Slam titles. In 1936 she was ranked No. 1 in singles by A. Wallis Myers . Contents

  2. Arthur Irving Jacobs (1858–1918) At the start of the 20th century, Arthur Irving Jacobs developed the modern drill chuck. After bruising his knuckles on one of the old-fashioned spanner adjusted drill chucks, he developed a chuck in which the jaws moved axially in inclined slots.

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