PPT-On May 9, 1899, John Albert Burr patented an improved rotar
Author : danika-pritchard | Published Date : 2016-06-03
John Albert Burr Alexander Miles Alexander Miles improved the method of the opening and closing of elevator doors and he improved the closing of the opening to the
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On May 9, 1899, John Albert Burr patented an improved rotar: Transcript
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