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Home › Hollow shaft drill bit and hollow insert with perforations or solid feeder auger(s) and perforated hollow shaft or solid flexible screw feeder auger(s)

Hollow shaft drill bit and hollow insert with perforations or solid feeder auger(s) and perforated hollow shaft or solid flexible screw feeder auger(s)

US Patent 12471510 · Granted Nov 18, 2025

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