B26F1/18—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material
B26F1/20—Perforating by slitting, i.e. forming cuts closed at their ends without removal of material with tools carried by a rotating drum or similar support
Landscapes
Life Sciences & Earth Sciences
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Forests & Forestry
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Engineering & Computer Science
(AREA)
Mechanical Engineering
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Perforating, Stamping-Out Or Severing By Means Other Than Cutting
(AREA)