Authority to sign as certificate will not sign a contract to be traded, but it will give a mandate to someone (his brother) signed the receipt, aket a mandate is necessary to check the legal department.
authorized person By certification Will not sign a contract. But to give the mandate to a third party (brother) signed by the authorized representatives of the majors need to monitor the legal department.
Authorized signer. According to certificate would not name a contract, but is authorized to individuals that 3 (brother), signed a document instead, which mandate to check from the law.