There are functional and can make their own income, and persuade people in the village came to practice and experiment, which can be made and then sold it, it has established and is able to sell it till now.
Functional and can make money for themselves. And persuade the villagers to practice. And do experiments that can be done, then sold it to a group. And can be sold today
Usefulness and can make for themselves. And persuade villagers practice. Groups which can do and sell, and has formed a group and can be sold to the present.