Nikola Tesla (1856-1943) boldly signed 5 ½â€™ x 10 ¼” Commutator or Multipactor diagram . Matted and framed with three black and white images, 3 ½” x 5 ½”, 6 ½” x 8” and 8” x 10”, with an overall size of 21” x 25”.

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