Abstract: In an electrostatic image recording apparatus employing a series of recording styluses for forming a latent image on an electrostatic image recording drum, an over-discharge is conducted either by applying a very high voltage to the recording styluses or by first subjecting the drum to a pre-charge in one polarity and then forming the latent image on the drum by an over-discharge in the opposite polarity. Pre-charging of the drum enhances the effect of the subsequent discharging and permits over-discharge to be conducted with a lower voltage applied to the recording styluses than would otherwise be possible.

Abstract: In an electrostatic print marking apparatus for printing markings on steel plates wherein an intermediate image carrying medium is used for transferring a toner image from an electrostatic image recording drum to a steel plate, a toner image transferred from the drum to the intermediate image carrying medium is re-charged before it is transferred from the image carrying medium to the steel plate.

Abstract: A process for preparing reinforced plastic plates comprising molding a thermosetting resin in a mold to form a plate-like body, forming spaced-apart slits extending in the longitudinal direction of the plate-like body with a spacing distance of 1 m at the most just after setting of the resin, suspending the plate-like body from one longitudinal end thereof, fixing a weight to the lower portion of the plate-like body, confining the plate-like body in the horizontal direction by at least one pair of fixing boards, heat-curing the plate-1ike body in the said state, and embedding an elastic resin in said slit portions of the plate-like body.