Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B23
MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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B23B
TURNING; BORING
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2251/00
Details of tools for drilling machines
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B23B2251/44
Margins, i.e. the narrow portion of the land which is not cut away to provide clearance on the circumferential surface
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B23B2251/443
Double margin drills
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