Flat drill
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United States of America Patent
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Jun 27, 2017
Grant Date -
Jul 23, 2015
app pub date -
Jan 23, 2014
filing date -
Jan 23, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A flat drill having a handle, and a flat blade formed in the front portion of the handle part. A front portion of the flat blade extends inwardly from the two sides, forming first and second shoulder. The two shoulders continuing to extend and taper inward and upward, forming two tapered sections respectively, a first tapered section and a second tapered section, and having a pointed top. A first groove is formed on a blade part of the first shoulder toward the inside of the flat blade part. The inner edge of the first groove is inclined downward towards outside direction of the first shoulder, forming an angle of greater than 0 degree with respect to a horizontal line of the flat drill.
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