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High-strength twist drill
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A kind of diplopore positioning drilling machine
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A kind of drill bit binary detection device
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A kind of spiral step drill bit of coating
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A kind of durable detection device of drill bit and its application method
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A kind of the cover drilling equipment
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A kind of drill pointing machine
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A kind of aligning cutting-off device
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A kind of spiral sawtoothed drill bit
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A kind of helical flue of drill shakes tooth machine
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A kind of drill bit straight trough shakes tooth machine
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A kind of adaptive drilling equipment
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