LOCOMOTIVE OR TRACTOR FOR PULLING EQUIPMENT IN A PIPE OR DRILL HOLE - Patent 0772728

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EP 0 772 728 A1

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(43)	Date of publication:
	14.05.1997 Bulletin 1997/20

(21)	Application number: 95910021.0

(22)	Date of filing: 14.02.1995

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International Patent Classification (IPC):

E21B 4/ 00^{( . )}
E21B 23/ 00^{( . )}

E21B 4/ 18^{( . )}

(86)	International application number:
	PCT/NO1995/000034

(87)	International publication number:
	WO 1995/021987 (17.08.1995 Gazette 1995/35)

(84)	Designated Contracting States:
	DE DK FR GB IT NL

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Priority:

14.02.1994 NO 19940000493

(71)	Applicant: NORSK HYDRO a.s.
	0240 Oslo (NO)

(72)	Inventors:
	BOE, Einar N-3670 Notodden (NO) CARLSEN, Hans, Paul N-3670 Notodden (NO) HOLGERSEN, Stig N-4030 Hinna (NO) HAUGERUD, Olav, Sveinung N-3800 Bo i Telemark (NO)

(74)	Representative: Bleukx, Luc
	Norsk Hydro Technology B.V., P.O. Box 2 4540 AA Sluiskil 4540 AA Sluiskil (NL)

(54)	LOCOMOTIVE OR TRACTOR FOR PULLING EQUIPMENT IN A PIPE OR DRILL HOLE