An external operation handle device for a circuit breaker includes a rotary handle equipped with a handle lock lever, a drive mechanism linking the rotary handle and the locker handle of the circuit breaker, and a door lock lever for interlocking between the rotary handle and a door of the board. The enrolling includes providing information requested by the authority network site. The hull provides stability and a smooth ride at both high and low speeds in smooth and rough water and is highly maneuverable. The two flows are merged again at a junction to provide a fluid flow having a predetermined abrasive-to-fluid mixture ratio.