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Horizontal-Drilling Machine

Description: Patent for a horizontally boring drill for use in trench warfare, including illustrations.
Date: November 26, 1918
Creator: Hughes, Howard R.
Partner: UNT Libraries Government Documents Department

Rotary Boring Drill

Description: Patent for rotary boring drill with explanation and the accompanying illustrations.
Date: November 6, 1917
Creator: Hughes, Howard R
Partner: UNT Libraries Government Documents Department
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