【正文】 hing a joint venture be still not ready after the said period， the said period can be extended， but in no circumstances shall it be extended for more than five years. article2transfer of technical know how and technical documentation 　the plete technical documentation of designs， calculations， drawings， manufacturing processes， quality control， tests， installation， adjustment， operation and maintenance shall be provided by part b to part a concerning the contracted products and must be the same as those being currently used by part b. 　checking and verifying the documentation of the contracted products: part b shall be responsible for the pleteness， correctness and legibility of the product design drawings and manufacturing technical documentation sent to part a. in case any part of the said drawings and documentation are missing， part b shall make supplementary delivery of correction immediately upon notification by part b. 　during the joint production period， part b shall， at most favoured prices， supply part a with spare parts of the contracted products which are not available in the market of part as side. these supplies are subject to separate agreements in due course. 　part b guarantees that the transfer of the technical knowhow and technical documentation hereof will not involve any accusation from any third party. article3prices and termsof payment 　part a shall pay part b for the transfer of technical knowhow and technical documentation of the medium speed marine main engine of type12v400zc stipulated in clause as follows: _________us _________（say: . only） _________us _________（say: . only） during the2yearsperiod mencing from19，the yearly fee shall be taken as _________% of the net annual production value （total annual production value minus the value of the imported parts and tax expenses）. 　the first payment is us $ _________（say: ） constituting % of total payment and shall be made within30（thirty） days after the contract is signed and es into force， upon receipt of the following documents from part b through the bank_________: supply air freight bill of the first batch of documentation according to the requirement of appendix_________。 b.　according to the definition of documentation in order to manufacture the medium speed maline main engine of type12v 600zc， site shall submit to part a the whole technical documentation and drawings of the contracted products before_________$$$after the signing of the contract. 　the products manufactured by part a shall be resold to part b as follows: medium speed marine engine of type12v 400zc_________sets per year。 c.　for manufacturing technical documentation， two prints shall be provided。 d.　test platform design drawings and its technical documents. manufacturing technical documentation: manufacturing technical documentation of the contracted products provided by part b shall include: the whole detailed instructive documentation and main ponents for the manufacturing of the contracted products， which shall include: requirements of quality inspection means， processes and technical conditions of acceptance test to the raw materials and ponents of the contracted products during and after the manufacturing processes. modification of documentation: if the documentation to be supplied is modified by site as a result of using new technology to improve the products， processes and reduce the cost， the detailed information shall be submitted to part a in written form. mode of providing documentation: a.　for general technical documentation， three prints of three legible copies should be provided。 b.　the calculating data and calculation manual of the contracted products。 b.　the technical specifications of the main ponents of the medi