H Kim, DA Nolet - US Patent 8,650,910, 2014 - Google Patents
2,081,935 A* 6/1937 Jones.............................. 501, 85 2,569,459 A 10, 1951 DeVoe et
al...................... 49/77 3,209,641 A* 10/1965 Upton............. 385,142 3,669.435 A* 6/1972 …