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Patent Certificate No. 10-0816068
Patent Certificate No. 10-0795171
Patent Certificate No. 10-0838833
Patent Certificate No. 10-0591358
Patent Certificate No. 10-0848303
Patent Certificate No. 10-0819182
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Patent Certificate No. 10-0816068
Patent Certificate No. 10-0795171
Patent Certificate No. 10-0838833
Patent Certificate No. 10-0591358
Patent Certificate No. 10-0848303
Patent Certificate No. 10-0819182