修正者 meaning in English

corrector
emendator
revisor

The ncc shall explain the strategy behind and reasons for any recommendations for improvement if such recommendations would involve the amendment of existing laws
改进建议涉及现行法律之修正者，通讯传播委员会应说明修正方针及其理由。
An amendment of an undertaking has no effect on the rights and obligations of the principal / applicant ( or an instructing party ) or of a confirmer of the undertaking unless such person consents to the amendment
保函之修正不影响主债务人/申请人(或指示人)或保证之保兑人的权利义务，但此类人同意该修正者，不在此限。