This contract shall come into force for thirteen (13) months from the date of signature of the contract by parties and extended if no party opposite when the contract expire.
本合同自买卖双方签署之日起生效，有效期为13个月并可以自动延长- - -若双方在合同期满时无异议的话。
Any additions, changes and modifications should be carried out in writing to this contract, authorized representatives of both parties effect the date of signature.
本合同的任何补充、变更和修改应当以书面方式进行，于双方授权代表共同签字之日起生效。
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.
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。
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