James Schaeffer

US 3,553,081 US 3.558,431 US 4,042,461 US 4,064,010 US 4,110,079 US 4,111,838 US 4,735,907 US 4,784,912 US 5,185,249 US 5,188,802 US 5,294,540 US 5,320,946 US 5,506,116 US 6,015,683 US 6,046,052 US 6,783,731