Lifting machinery. Special equipment includes boilers, pressure vessels, pressure pipes, elevators, hoisting machinery, passenger ropeways, amusement facilities, and on-site motor vehicles. Improvements in various process methods in the mechanical field can apply for invention patents, and hoisting machinery can carry out processes. Invention patents can be written for improvements, so it is easy to write invention patents in the field of special equipment and lifting machinery. Special equipment is a general term for equipment and facilities that involve life safety and are highly dangerous.