| http://www.w3.org/ns/prov#value | - A perforating machine for joining together at intervals laminated sheets of fibrous paper strips comprising upper and lower rollers, spaced apart at their most adjacent point where the sheets are passed between the rollers, the upper roller having a thin flat blade mounted transversely therein, perpendicular to the axis of the roller, the outer edge of the blade having spaced groups of sharp trian
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