軸受
Project Diana, chapter 10:
↑ Bearing Industry Timeline - ウェイバックマシン(2009年4月1日アーカイブ分)
↑ American Society of Mechanical Engineers (1906), Transactions of the American Society of Mechanical Engineers, 27, American Society of Mechanical Engineers, p. 441.
↑ Bicycle History, Chronology of the Growth of Bicycling and the Development of Bicycle Technology by David Mozer
↑ 業界再編の動向・ベアリング