Computer and Scientific

Owner

TELECO OILFIELD SERVICES, INC.

—

Computer and Scientific

Owner

TELECO OILFIELD SERVICES, INC.

—

Electrical and Scientific Apparatus

Owner

TELECO OILFIELD SERVICES, INC.

—

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

—

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Aug 4, 1992

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Sep 18, 1990
HIGH PERFORMANCE DRILLING SERVICE

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Oct 2, 1990
DRILLING DYNAMICS

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Oct 30, 1990
DPR DUAL PROPAGATION RESISTIVITY MWD

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Jul 14, 1992
WE BRING OUT THE BEST IN MWD

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Nov 13, 1990
MAGNA DRILL

Building Construction and Repair

Owner

TELECO OILFIELD SERVICES INC.

Mar 13, 1990
RECORDED-WHILE-DRILLING

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

—
REAL-TIME LOGGING

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Dec 26, 1989
MAGNA DRILL

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

—
MAGNA DRILL

Machinery

Owner

TELECO OILFIELD SERVICES INC.

Aug 15, 1989
MAGNA

Machinery

Owner

TELECO OILFIELD SERVICES INC.

Aug 29, 1989
DISCOVERER II

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

—
DISCOVERER I

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Mar 28, 1989
DISCOVERER

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

Mar 21, 1989
MAGNA-DRILL

Machinery

Owner

TELECO OILFIELD SERVICES, INC.

Aug 7, 1984
TELECO

Electrical and Scientific Apparatus

Owner

TELECO OILFIELD SERVICES INC.

Sep 8, 1981
TELECO

Electrical and Scientific Apparatus

Owner

TELECO OILFIELD SERVICES INC.

Sep 8, 1981
TELECO

Computer and Scientific

Owner

TELECO OILFIELD SERVICES INC.

May 18, 1982