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us patent 4 948 781
us patent 4 856 878
us patent 4 438 281
us patent 8 644 029
us patent no. 4 414870
us patent 6 754 472
u.s. patent 4 905 394
united states patent 3118824
u.s. patent 4 877 027
united states patent 10415148
us patent no. 174465
u.s. patent no. 4 528 626
us patent 8 827 324 pdf
us patent 10703789 b2
u.s. patent no. 4 744 360
u.s. patent #5844673
united states patent no. 8 864 707
patent 9 724 840
patent 7 979 318
patent 9 724 605
u.s. patent 5 834 476
united states patent 11566338
united states patent 10900128
u.s. patent no. 8 856 383
us patent 4 948 781, us patent 4 856 878, us patent 4 438 281, us patent 8 644 029, us patent no. 4 414870, us patent 6 754 472, u.s. patent 4 905 394, united states patent 3118824, u.s. patent 4 877 027, united states patent 10415148, us patent no. 174465, u.s. patent no. 4 528 626, us patent 8 827 324 pdf, us patent 10703789 b2, u.s. patent no. 4 744 360, u.s. patent #5844673, united states patent no. 8 864 707, patent 9 724 840, patent 7 979 318, patent 9 724 605, u.s. patent 5 834 476, united states patent 11566338, united states patent 10900128, u.s. patent no. 8 856 383