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Mack C. Colt Inc.
Mack Oil, Co.
Masterlog Inc.
Mayfield-Payne, Inc.
MBC
McCullough
McCullough Petro-Log
McCullough Tool Co.
Mercury
Mercury Wireline, Inc.
Mezintel
Mid America Pipeline Company
Mid Continent Well Logging Ser
Midwest Surveys
Midwest Wireline
Mobil
Monfort
MPI
Multi-Shot