Need. You need to sign a transfer contract to buy snack car. Snack technology belongs to individual patented technology, and the model contract for the transfer of snack technology is as follows: the content of technical data, the time, method and place of submitting data, the scope of using technology, the technical confidentiality period, the acceptance method of using technology, the turnover and payment method, and how much liquidated damages will be borne if the contract terms are violated.