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Roller-Drill

Description: Patent for a roller drill that has a roller spindle which is detachable.
Date: November 28, 1911
Creator: Hughes, Howard Robard
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Roller Drill.

Description: Patent for roller drills that will leave a central core standing in the hole being formed composed of six cutting rollers.
Date: November 28, 1911
Creator: Hughes, Howard R.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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