us patent number 3239660
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us patent number 6630507
us patent number 3088336
us patent 8 644 029
us patent no. 174465
us patent number 8835624
us patent number 1338343a
us patent # 4686605
us patent number 5356368
us patent no.4530956
us patent 11 905 929
us patent 4233197 e
us patent no 4713333
united states patent 9441306
us patent # 6470214
united states patent 3932198
us patent 8 999 263
us patent no. 6224844
patent number search 219833
u.s. patent #5844673
us patent number 6630507, us patent number 3088336, us patent 8 644 029, us patent no. 174465, us patent number 8835624, us patent number 1338343a, us patent # 4686605, us patent number 5356368, us patent no.4530956, us patent 11 905 929, us patent 4233197 e, us patent no 4713333, united states patent 9441306, us patent # 6470214, united states patent 3932198, us patent 8 999 263, us patent no. 6224844, patent number search 219833, u.s. patent #5844673
