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DAYLIGHT RESOURCES TRUST
Changed name to Daylight Energy Limited in May 2010.



NOWATA FILTRATION
see NMW Inc.



NOWATA MACHINE WORKS INC
see NMW Inc.



NUNEZ CONSTRUCTION COMPANY
Parent of Piling Inc



NUCLEAR UTILITY SERVICES CORPORATION - NUS
Acquired by Halliburton in 1980 and name changed to NUS Environmental Corporation.



NUTTER ENGINEERING
see Sulzer Chemtech USA



OFFSHORE DATA SERVICES INC



OGDEN ENVIRONMENTAL & ENERGY SERVICES CO INC
See Amec Earth & Environmental



OIL COUNTRY MANUFACTURING
Acquired by Weatherford International Inc in 2000



OIL DYNAMICS INC - ODI
Acquired by Centrilift from Franklin Electric in 1998.



OIL & GAS SUPPLY COMPANY
see Weatherford Global Compression Services, L.P.



OIL TECHNOLOGY SERVICES INC
Acquired by PPI Technology Services in 2000



STS OILFIELD SPECIALTY & SUPPLY LLC
Acquired by National Oilwell Varco in 2002.



OILQUIP RENTALS INC
Merged into Allis-Chalmers on May 2001.



OILFIELD MOTOR SERVICE - OMS INC
Acquired by EnDyn (Energy Dynamics Inc) in 1981.



ONIX PROCESS ANALYSIS
See Thermo Electron Process Instruments Division



OSAGE HOT OIL SERVICE
see Osage Hot Oil Company



OSCA INC
Acquired by the BJ Services Co in May 2002



P/L ENVIRONMENTAL MAINTENANCE CORPORATION
See PLEM Corporation



PANHANDLE INDUSTRIAL CORPORATION
See Nickles Industrial manufacturing Corporation



PATCO-POSITIVE ACTION TOOL COMPANY
see Enterra Patco Oilfield Products Inc



PATENT SCAFFOLDING COMPANY
see Patent Construction Systems



PATHWAY BELLOWS INC
was acquired by Senior Flexonics Pathway in 1999.



PRESSURE CONTROL ENGINEERING - PCE
Acquired by Tuboscope Vetco International Inc in September 1996.



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