us patent 6 754 472
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us patent 6 754 472
us patent 6 943 629
us patent 6 446 111
us patent 6 957 117 b2
u. s. patent no. 11 906 754
us patent 6 139 898
us patent 6 306 466
us patent 8 644 029
us patent number 6630507
us patent 6 630 806
us patent 9 650 741
us patent 4 948 781
us patent no. 174465
us patent 7 120 795
us patent # 4686605
us patent 4 856 878
u.s. patent 6 372 224
united states patent 4724244
us patent 6506148 b2
patent 9 058 756
us patent no 6470214
us patent 9 697 905
u.s. patent no. 528 671
patent 9 724 605
u.s. patent.no.6 695 222
us patent 6 754 472, us patent 6 943 629, us patent 6 446 111, us patent 6 957 117 b2, u. s. patent no. 11 906 754, us patent 6 139 898, us patent 6 306 466, us patent 8 644 029, us patent number 6630507, us patent 6 630 806, us patent 9 650 741, us patent 4 948 781, us patent no. 174465, us patent 7 120 795, us patent # 4686605, us patent 4 856 878, u.s. patent 6 372 224, united states patent 4724244, us patent 6506148 b2, patent 9 058 756, us patent no 6470214, us patent 9 697 905, u.s. patent no. 528 671, patent 9 724 605, u.s. patent.no.6 695 222