Patent Number
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8413848
8087394
7837140
7793687
7784560
7707802
7597525
7568511
7462252
7175017
6971159
6905284
6688498
6647820
6604664
6601741
6555776
6435331
6422217
4828789
4678623
4666657
4645640
4538779
4448372
4437627