XIII. The contract shall go into force after the signature of both parties. Alteration or signature without written authorization is invalid.

本合同自甲、乙双方签字或盖章之日起生效，涂改或未经书面授权代签无效。

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XIII. The contract shall go into force after the signature of both parties. Alteration or signature without written authorization is invalid.

本合同自甲、乙双方签字或盖章之日起生效，涂改或未经书面授权代签无效。

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