Method and apparatus for selectively straight or directional dri

Details Method and apparatus for selectively straight or directional dri Method and apparatus for selectively straight or directional dri

1985-12-18

1986-09-09

Leppink, James A.

Boring or penetrating the earth

With tool shaft detail

175325, E21B 1710, E21B 1720

Patent

active

046103074

ABSTRACT:
A device for use in underground drilling comprising:

REFERENCES:
patent: 2829864 (1958-04-01), Knapp
patent: 3135103 (1964-06-01), Black
patent: 3563323 (1971-02-01), Edgecombe
patent: 3730286 (1973-05-01), Weiner
patent: 3938853 (1976-02-01), Jurgens et al.
patent: 4319649 (1982-03-01), Jeter
patent: 4465147 (1984-08-01), Feenstra et al.

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