YC Spitsberg, NJ Weister - US Patent 7,518,476, 2009 - Google Patents
3,360,751 A* 12, 1967 Gauthier et al.............. 335/175 4,000,478 A* 12/1976 Jencks et
al........ 335/34 4,064,469 A* 12, 1977 Gryctko......................... 335/6 4,097.831 A* 6/1978 …