Inventor Villager profession

This villager would be and inventor and would sell items like rails and spyglasses. you could sell him 5 copper for an emerald. I'm not sure what the profession block would be yet. sorry. i think this would be a very cool idea for the caves and cliffs seeing as that you would need rails in the caves and hat you could sell him copper and/or amethyst. I thank everyone the support and hope my idea would be considered.