APPARATUS FOR FORMING INCLINED BORES
United States Patent 3486572

Inventors:
Hamilton, William H.
Allyn, Richard J.
Publication Date:
12/30/1969
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Assignee:
LAWRENCE MFG CO
Primary Class:
175/53
Other Classes:
299/31, 175/99, 175/220, 175/94, 175/118
International Classes:
E21B7/28; E21B15/00; E21D9/11; E21B7/00; E21D9/10; E21C23/00; E21D3/00; E21B3/12
US Patent References:
2637527Well drilling device
2998964Rotary tunneling device having radially adjustable cutters
3109635Adjustable boring head for continuous mining machine
3282356Drilling device
3376942Large hole vertical drilling apparatus
3382002Rotary cutter wheel tunneling machine
Foreign References:
FR1457753A
DE1173860B




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