Seismic hazard due to small shallow induced earthquakes

Device for transferring magnetic signals of a master sheet having a spiral recording track to magnetic sheets wherein a magnetic sheet to be copied (transferred) is intermittently fed so as to be overlaid upon the master sheet held stationary; both of the master and magnetic sheets are pressed against each other by a vertically movable pressure plate; the magnetic fields are applied to both of the sheets for transfer; and the holes for positioning are punched through the magnetic sheet by the punching means fixed to the pressure plate.

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