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Lemp, Hermann. U.S. Patent No. 1,154,785, filed April 8, 1914, and issued September 28, 1915. Accessed via Google Patent Search at: US Patent #1,154,785 (页面存档备份,存于互联网档案馆) on February 8, 2007.
Lemp, Hermann. U.S. Patent No. 1,154,785, filed April 8, 1914, and issued September 28, 1915. Accessed via Google Patent Search at: US Patent #1,154,785 (页面存档备份,存于互联网档案馆) on February 8, 2007.