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(X0) 16191486: SYSTEM FOR ISSUING CERTIFICATE BASED ON BLOCKCHAIN NETWORK, AND METHOD FOR ISSUING CERTIFICATE BASED ON BLOCKCHAIN NETWORK BY USING SAME

(A1) 20190081800: SYSTEM FOR ISSUING CERTIFICATE BASED ON BLOCKCHAIN NETWORK, AND METHOD FOR ISSUING CERTIFICATE BASED ON BLOCKCHAIN NETWORK BY USING SAME

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(X0) 16191480: SYSTEM FOR AUTHENTICATING CERTIFICATE BASED ON BLOCKCHAIN NETWORK, AND METHOD FOR AUTHENTICATING CERTIFICATE BASED ON BLOCKCHAIN NETWORK BY USING SAME

(A1) 20190081799: SYSTEM FOR AUTHENTICATING CERTIFICATE BASED ON BLOCKCHAIN NETWORK, AND METHOD FOR AUTHENTICATING CERTIFICATE BASED ON BLOCKCHAIN NETWORK BY USING SAME

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