Items

Items

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  [E1536BJ], Letter from Betts and Betts Corp, Harry A Yerkes to Thomas Alva Edison, October 25th, 1915

  1915-10-25
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  [E1536BL], Letter from Betts and Betts Corp, Louis Heugerer to West Orange Laboratory, November 11th, 1915

  1915-11-11
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  [E1565QJ], Letter from Harry A Yerkes, Betts and Betts Corp to Thomas Alva Edison, December 9th, 1915

  1915-12-09