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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B23B2251/24
Overall form of drilling tools
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B23B2251/241
Cross sections of the diameter of the drill
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B23B2251/245
Variable cross sections
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