Exterior wiper head for drill pipe

Details Exterior wiper head for drill pipe Exterior wiper head for drill pipe

1990-10-09

1992-12-08

Holtje, Nelson C.

Machines not elsewhere specified

Material working, abrading, or founding machinery

Element or attachment

Patent

active

D03315860

REFERENCES:
patent: D223685 (1972-05-01), McPherson
patent: D285798 (1986-09-01), Brunnegard et al.
patent: D296559 (1988-07-01), Drabinski
patent: 4494607 (1985-01-01), Ford et al.
patent: 4703804 (1987-11-01), Stokes et al.
patent: 4895205 (1990-01-01), Thompson et al.
patent: 5101896 (1992-04-01), Thompson et al.

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