Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor {specially adapted for perforating tubes by machining, e.g. cutting, grinding, projections on the tube wall}
Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor {specially adapted for perforating tubes by machining, e.g. cutting, grinding, projections on the tube wall}