The original manipulator space has multiple degrees of freedom and is combined with a rail system for horizontal travel. When the operator uses manual horizontal movement or swings the manipulator joints, the operation control is poor and
- History of Gas Pump Evolution - The roots of the world's first gas pump can be traced back to a grocery store in Indiana in the 1880s. In 1885, Sylvanus-Freelove-Bowser Bowers invented the kerosene pump, which consisted of a marble valve,