Where does the patent agency business come from?

First, it has something to do with the patent office, and they will contact you for business. Second, they will find their own technology research and development company. They have a lot of patent applications, so they should find more companies, especially the company owners. Third, they should raise their awareness. Fourth, the stupidest way is to rent a small bungalow near the patent office and let several people take over the business at ordinary times.