If you can make him as the customer / manufacturing & distributing your capital goods. May be you can Imagine to grant an exclusive license to the design of the machine, ownership of IPR rights with you. It can be for a term of about 1 year / 3 years etc.,
Disclaimer: Scenario is hypothetical. Decision should be taken based on your business interests.
Let me know, if you need further details.
Corporate, Commercial & IP Lawyer
IP Lex Global Services