建筑安装工程承包合同书(24)

article 21-　effective date of the contract
　　　　1.　the effective date of this contract shall be the date after its execution when all the necessary approvals of the respective authorities have been obtained by the owner.
　　　　2.　if the contract does not become effective within（_________） days from the date of execution， it will be deemed void unless otherwise agreed between the parties.
article 22-　law and regulations
　　　　1.　the contractor shall in all matters relating to the performance of this contract conform with all applicable laws， regulations and orders of central or local authorities.
　　　　2.　the construction， validity and performance of this contract shall be governed in all respects in accordance with the laws of _________
article 23-　entire contract
　　　　1.　this contract constitutes the entire agreement between the parties hereto and supersedes all prior negotiations， representations or agreements whether oral or in writing relative to the subject matter of this contract.
　　　　2.　this contract shall be altered or supplemented only by mutual consent in writing between the owner and the contractor.
article 24-　language of the contract
　　this contract was drafted in english language and the english text of this contract shall be valid and binding upon the parties hereto.
article 25-　notices
　　　　1.　every notice， consent， instruction， order or decision given under this contract shall be given or made in writing and either personally served on an officer of the party to whom it is given or airmailed post-prepaid or sent by telegram， telex or cable subsequently confirmed by letter， addressed as follows: to:the owner (address) _________to: the contractor (address) _________.
　　　　2.　notices， consents， requests and other documents shall be deemed delivered or given， if mailed to an overseas destination， on the (_________) th day after the date of mailing and， if mailed to a domestic destination， the (_________) th day after the date of mailing. notices， consents or requests sent by telegram， telex or cable shall be deemed delivered or given on the day they are despatched.