Navigation bar: Search Patents > Utility Patent 1,521,743 > Drawings: Page 1/7 Page 2/7 Page 3/7 Page 4/7 Page 5/7 Page 6/7 Page 7/7 Text:  7 pages Page 1/7 Page 2/7 Page 3/7 Page 4/7 Page 5/7 Page 6/7 Page 7/7