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Here are a few of the 50 or so patents issued to DonLeslie:

Year     Number        Inventor(s)                         Title/Description
1952   2,622,692      Leslie           Apparatus for imposing vibrato on sound.
1952   2,622,693      Leslie           Apparatus for imposing vibrato on sound.
1962   3,058,541       Leslie           Rotary electrostatic speaker.

A more complete collection of Leslie's patents has been compiled by ?JohnFine as is available at http://hammond-leslie.com/DonLesliesPatents/.

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