Patents.
3,860,342; 3,861,806; 3,867,032; 3,867,038; 3,867,571; 3,900,884; 3,905,674; 3,907,402; 3,909,102; 3,909,112; 3,910,677; 3,910,680; 3,910,681; 3,910,682; 3,910,704; 3,911,206; 3,911,209; 3,912,364; 3,912,373; 3,912,376; 3,912,378; 3,912,394; 3,912,395; 3,914,020; 3,914,023; 3,914,025; 3,914,032; 3,914,054; 3,914,055; 3,914,877; 3,915,557; 3,915,564; 3,915,575; 3,916,195; 3,916,197; 3,916,205; 3,917,391; 3,917,399; 3,918,028; 3,918,791; 3,918,797; 3,918,798; B 382,783.