本协议自双方授权代表签字盖章之日起生效。
The validity of this agreement start from the date when the represent signature and step.
躼本意向书自甲乙双方代表签字盖章之日起生效，有效期一年。
This letter of intent is effected after signed by both parties, and valid within one year.
本合同于双方签字盖章之日起生效，至原厂提供的质保期结束时终止。
The effective date of this contract shall commence upon the date of signature and seal by parties hereto, which shall terminate on end and conclusion of guarantee period by original manufacturer.
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