A socket for an electrical part is provided with a socket body for accommodating an electrical part and a guide member is provided for the socket body so as to guide side surfaces of a body of the electrical part at the time of the accommodation thereof. The rotatable cutting blade is mounted for rotation about an axis which extends generally laterally with respect to a normal feed direction of the sheet material to the cutting zone and the direction of rotation of the peripheral edge portion through the cutting zone is in the normal feed direction. According to one aspect of the present invention, the system functions to equalize and orthogonalize lower dimensional output signals by reducing the covariance matrix of the output signals to the form of a diagonal matrix or constant times the identity matrix. The rotor has a shaft extended outwardly from the second housing and disposed in the accommodating space. The device includes a compact variable flow-control that is inserted in a shielding gas delivery hose at a predetermined distance from the solenoid end to reduce gas waste and provide a controlled amount of extra gas at the weld start. An alternating voltage is applied to the sleeve to form an alternating electric field between the sleeve and the drum to develop the electrostatic image with the developer.