| (84) |
Designated Contracting States: |
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DE FR IT NL SE |
| (30) |
Priority: |
23.12.1997 GB 9727219
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| (43) |
Date of publication of application: |
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11.10.2000 Bulletin 2000/41 |
| (73) |
Proprietors: |
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- WesternGeco Seismic Holdings Limited
Roadtown,
Tortola (VG) Designated Contracting States: DE IT NL SE
- SERVICES PETROLIERS SCHLUMBERGER
75007 Paris (FR) Designated Contracting States: FR
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| (72) |
Inventors: |
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- LINDEMAN, Gunnar, Andreas
N-1344 Haslum (NO)
- KRISTIANSEN, Ottar
N-0275 Oslo (NO)
- RAMSTAD, Arne
N-1370 Asker (NO)
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| (74) |
Representative: Suckling, Andrew Michael et al |
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Marks & Clerk,
4220 Nash Court,
Oxford Business Park South Oxford,
Oxfordshire OX4 2RU Oxford,
Oxfordshire OX4 2RU (GB) |
| (56) |
References cited: :
WO-A-94/02744 US-A- 2 397 957 US-A- 4 640 533
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DE-A- 2 352 802 US-A- 4 171 674 US-A- 5 722 340
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