Item is a typescript copy of Georg Zuelzer's application for United States patent no. 1,027,790 with amendments made in red ink. The application was originally filed May 6, 1908 and was amended 5 times. The parts of the application filed May 6, 1908 are the petition, affidavit, and specification. Amendments to the application were made July 8, 1909, July 14, 1909, Aug. 3, 1910, Sept. 29, 1911 and Nov. 4, 1922. Samples were filed with the July 14, 1909 amendment.