Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1987-10-05
1988-11-29
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175410, E21B 1046
Patent
active
047874660
ABSTRACT:
A cutting component comprising:
REFERENCES:
patent: 4244432 (1981-01-01), Rowley et al.
patent: 4382477 (1983-05-01), Barr
patent: 4505721 (1985-03-01), Almond et al.
patent: 4520881 (1985-06-01), Phaal
patent: 4679639 (1987-07-01), Barr
Tank Klaus
Tomlinson Peter N.
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