u.s. patent no. 4 744 360
u.s. patent no. 4 744 360, u.s. patent no. 4 528 626, us patent no. 4 414870, us patent no. 4 136 359, u.s. patent 4 905 394, u.s. patent 4 877 027, us patent 4 948 781, us patent 4 438 281, u.s. patent 4 960 002, u.s. patent no. 7 493 396, us patent no. 6224844, us patent no. 174465, us patents 4 357 600, u.s. patent 9 370 773, u.s. patent #5844673, us patent # 4 000 922, u.s. patent 6 372 224, u.s. patent number 6 217 242, us patent 4 412 106, us patent 8 644 029, u.s. patent 624 749, u.s. patent 9 724 840, us patent 6 360 401, us patent 6 754 472, usa patent no.4 509 865
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u.s. patent no. 4 744 360
u.s. patent no. 4 528 626
us patent no. 4 414870
us patent no. 4 136 359
u.s. patent 4 905 394
u.s. patent 4 877 027
us patent 4 948 781
us patent 4 438 281
u.s. patent 4 960 002
u.s. patent no. 7 493 396
us patent no. 6224844
us patent no. 174465
us patents 4 357 600
u.s. patent 9 370 773
u.s. patent #5844673
us patent # 4 000 922
u.s. patent 6 372 224
u.s. patent number 6 217 242
us patent 4 412 106
us patent 8 644 029
u.s. patent 624 749
u.s. patent 9 724 840
us patent 6 360 401
us patent 6 754 472
usa patent no.4 509 865
u.s. patent no. 4 744 360, u.s. patent no. 4 528 626, us patent no. 4 414870, us patent no. 4 136 359, u.s. patent 4 905 394, u.s. patent 4 877 027, us patent 4 948 781, us patent 4 438 281, u.s. patent 4 960 002, u.s. patent no. 7 493 396, us patent no. 6224844, us patent no. 174465, us patents 4 357 600, u.s. patent 9 370 773, u.s. patent #5844673, us patent # 4 000 922, u.s. patent 6 372 224, u.s. patent number 6 217 242, us patent 4 412 106, us patent 8 644 029, u.s. patent 624 749, u.s. patent 9 724 840, us patent 6 360 401, us patent 6 754 472, usa patent no.4 509 865