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us patent 8 644 029
us patent 8 999 263
us patent # 6470214
us patent # us-5356368
us patent 4 948 781
united states patent no. 8 864 707
us patent 6 139 898
us patent number 3239660
us patent 6 446 111
us patent number 5356368
us patent 4 438 281
us patent no. 174465
us patent 9 697 905
us patent 4 856 878
us patent no. 6224844
u.s. patent 8 005 759
us patent number 6470214
us patent no. 10888045
u.s. patent no. 8 856 383
us patent 11 905 929
united states patent 3932198
u.s. patent #5844673
u.s. patent no. 528 671
u.s. patent no. 10 869 843
us patent 8 644 029, us patent 8 999 263, us patent # 6470214, us patent # us-5356368, us patent 4 948 781, united states patent no. 8 864 707, us patent 6 139 898, us patent number 3239660, us patent 6 446 111, us patent number 5356368, us patent 4 438 281, us patent no. 174465, us patent 9 697 905, us patent 4 856 878, us patent no. 6224844, u.s. patent 8 005 759, us patent number 6470214, us patent no. 10888045, u.s. patent no. 8 856 383, us patent 11 905 929, united states patent 3932198, u.s. patent #5844673, u.s. patent no. 528 671, u.s. patent no. 10 869 843
