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U.S. PATENT AND TRADEMARK OFFICE
Electronic Information Products Division
Patent Technology Monitoring Team (PTMT)

Patenting In Technology Classes,
Breakout By Organization

Count of 1969 - 2008 Utility Patent Grants,
By Calendar Year of Grant
With Patent Counts Based on Primary Patent Classification

- Explanation of Data -

Rank Ordered Listing of Organizations Receiving 5 or More Utility Patents During the Period
Having Primary Classification In

Class 175, Boring or Penetrating the Earth

( technology class is determined by the primary classification assigned to the patent- see 'Explanation of Data' )
( patent ownership is determined by the first-named assignee listed on a patent )

The following table displays first-named assignees and counts of their associated patents, as distributed by the year of patent grant.
First-Named Assignee 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 Total
~INDIVIDUALLY OWNED PATENT 61 34 48 54 38 52 37 29 35 57 30 46 50 29 52 54 51 41 35 40 50 50 52 52 36 44 46 45 29 53 45 42 49 39 37 33 33 34 53 47 1742
SMITH INTERNATIONAL INC. 0 1 4 6 3 8 2 7 7 17 11 19 28 5 7 9 9 8 7 5 8 4 8 7 1 16 10 9 8 9 10 10 26 25 38 27 12 25 23 40 479
BAKER HUGHES INCORPORATED 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 4 2 14 13 11 22 11 19 14 17 32 32 43 29 27 15 13 26 22 20 387
DRESSER INDUSTRIES, INC. 2 0 6 10 12 8 5 12 8 1 9 10 13 2 5 6 6 4 4 4 3 1 7 2 3 2 8 7 5 12 6 10 10 2 0 0 0 0 0 0 205
SCHLUMBERGER TECHNOLOGY CORPORATION 9 11 4 7 2 1 4 4 1 0 0 3 0 0 1 0 4 1 4 1 3 2 3 3 1 5 4 5 4 2 2 7 6 15 7 9 6 12 11 12 176
HALLIBURTON ENERGY SERVICES, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 3 5 19 22 15 17 19 27 16 19 164
SHELL OIL COMPANY 6 4 4 3 9 3 2 0 0 1 1 0 1 2 0 2 2 3 2 2 6 2 2 4 0 1 0 1 0 2 1 1 2 1 2 4 3 6 10 11 106
HUGHES TOOL COMPANY 5 2 0 1 3 2 4 5 1 2 0 2 5 4 7 3 7 9 12 7 2 6 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 92
SANDVIK AKTIEBOLAG 0 0 0 0 1 0 0 0 2 0 0 4 9 0 2 0 1 0 0 1 0 1 1 1 1 4 2 2 1 3 12 13 7 3 3 1 3 0 0 0 78
WEATHERFORD/LAMB, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 2 1 3 6 4 4 13 22 11 4 73
HILTI AKTIENGESELLSCHAFT 0 0 0 2 0 0 0 0 1 0 1 1 0 0 3 4 1 0 0 1 0 4 2 2 1 0 1 4 2 4 0 5 3 4 13 4 3 3 3 0 72
INGERSOLL-RAND COMPANY 4 3 3 1 2 3 2 2 2 1 0 0 0 0 1 1 2 1 1 2 3 2 2 4 3 1 3 4 3 4 0 1 2 1 0 2 0 0 0 0 66
KENNAMETAL INC. 0 2 1 1 2 4 4 1 0 1 0 0 0 3 0 0 2 1 1 1 2 1 0 3 2 3 3 0 0 3 3 3 2 0 2 1 4 0 3 0 59
ATLANTIC RICHFIELD COMPANY 1 1 3 5 5 4 0 0 0 0 0 0 0 1 1 2 2 2 6 3 0 2 1 4 5 3 3 0 0 1 1 0 2 0 0 0 0 0 0 0 58
CHARLES MACHINE WORKS, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 2 1 2 3 2 2 2 1 3 1 2 5 0 2 5 2 6 4 9 55
VERMEER MANUFACTURING COMPANY, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 4 3 2 5 13 8 5 4 3 3 1 52
CONOCO, INC. 1 1 0 0 3 3 5 4 1 1 1 1 3 0 3 3 1 0 1 2 2 2 3 0 5 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 49
EXXON PRODUCTION RESEARCH COMPANY 1 7 3 6 3 2 1 2 1 2 1 1 2 0 0 2 2 1 2 2 0 1 0 1 0 2 1 0 0 0 1 0 0 0 0 0 0 0 0 0 47
INSTITUT FRANCAIS DU PETROLE 2 1 1 1 3 1 1 0 0 0 0 3 3 1 1 0 0 0 0 1 3 1 2 1 3 4 3 1 1 1 0 2 1 0 0 0 0 1 1 0 44
MOBIL OIL CORP. 5 4 2 1 2 1 0 0 0 0 1 1 1 2 4 7 1 4 3 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 43
REED TOOL COMPANY 0 2 0 3 4 2 2 2 4 1 0 1 3 0 0 0 1 4 3 2 5 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 42
HALLIBURTON CO. 0 0 0 1 0 0 1 0 2 0 1 0 0 1 0 1 3 3 6 0 1 1 1 3 2 4 1 2 4 2 0 0 0 0 0 0 0 1 0 0 41
CAMCO DRILLING GROUP LTD. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 4 1 2 5 13 9 2 2 0 0 0 0 0 0 0 0 40
AMOCO CORPORATION 0 0 0 0 0 0 0 0 1 2 2 1 2 1 2 2 0 0 3 1 5 5 4 1 2 1 2 1 1 0 0 0 0 0 0 0 0 0 0 0 39
CAMCO INTERNATIONAL INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 2 0 3 4 1 4 4 5 4 3 1 0 0 0 0 0 0 35
BAKER INTERNATIONAL CORP. 0 0 3 4 3 4 1 0 1 1 0 0 1 0 1 3 4 3 3 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 34
CHRISTENSEN, INC. 0 0 0 0 0 0 0 0 1 3 0 4 6 6 1 6 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 33
CAMCO INTERNATIONAL (UK) LIMITED 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 18 2 7 0 0 0 0 0 0 32
HAWERA PROBST GMBH & CO. 0 0 0 0 0 0 0 0 0 0 0 2 1 0 0 1 0 1 3 2 3 5 1 0 0 0 1 1 0 1 0 0 3 1 0 1 2 0 0 0 29
NORTON CHRISTENSEN, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 12 11 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 28
EASTMAN CHRISTENSEN CO. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 5 9 5 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 27
BAROID TECHNOLOGY, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 2 2 1 6 3 4 1 1 0 2 0 0 0 0 1 0 0 0 26
VARCO I/P, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 3 4 6 5 5 26
WESTERN WELL TOOL, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 2 7 0 4 2 4 3 3 26
M-I L.L.C 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 2 5 3 1 3 1 3 1 2 24
ATLAS COPCO AB 0 1 1 2 1 1 4 5 0 1 0 2 0 1 2 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 23
NL INDUSTRIES INC. 0 1 1 0 1 0 0 0 1 0 0 0 1 1 0 1 4 2 6 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22
GULF RESEARCH AND DEVELOPMENT COMPANY 5 5 3 2 1 1 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 21
CDX GAS, LLC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 7 1 3 4 3 0 20
REED ROCK BIT COMPANY 0 0 0 0 0 0 0 0 0 0 0 0 0 1 8 3 5 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 20
EARTH TOOL COMPANY, L.L.C. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 1 5 5 4 1 0 0 0 0 19
TRACTO-TECHNIK PAUL SCHMIDT SPEZIALMASCHINEN KG 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 2 1 5 3 2 3 1 0 0 0 0 0 19
STRATA BIT CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 2 4 2 3 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 18
TEXACO INC. 0 0 2 2 1 5 1 0 0 0 0 1 0 0 0 0 0 1 2 0 0 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 18
UNION OIL COMPANY OF CALIFORNIA 0 0 0 0 0 0 0 0 0 2 1 0 1 0 0 0 0 0 0 0 1 0 2 0 2 6 1 0 1 1 0 0 0 0 0 0 0 0 0 0 18
CHRISTENSEN DIAMOND PRODUCTS COMPANY 3 1 3 0 4 1 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15
GAS RESEARCH INSTITUTE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 0 3 4 0 0 0 0 0 0 1 1 0 1 0 1 0 0 0 0 0 0 15
MAURER ENGINEERING INC. 0 0 0 0 0 0 0 0 0 4 0 2 1 1 1 0 0 1 1 0 1 0 2 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 15
NL PETROLEUM PRODUCTS LIMITED 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 6 4 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15
PHILLIPS PETROLEUM COMPANY 0 0 1 0 1 1 1 0 1 0 1 0 0 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 1 4 0 0 0 0 0 0 0 15
SANTRADE LTD. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 1 4 1 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 15
UNITED STATES OF AMERICA, NAVY 2 1 1 3 0 2 1 1 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 15
GENERAL ELECTRIC COMPANY 3 0 0 0 1 0 0 0 0 2 0 1 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 1 1 0 0 0 0 0 0 0 14
MERLIN TECHNOLOGY, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 4 2 5 1 14
SANDVIK INTELLECTUAL PROPERTY AB 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 6 4 14
SUN OIL COMPANY OF PENNSYLVANIA 0 2 3 2 1 1 3 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 14
CAMPAGNIE FRANCAISE DES PETROLES, SOCIETE ANONYME 0 0 0 4 1 1 2 2 0 0 0 2 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13
DAILEY PETROLEUM SERVICES CORP. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 0 0 1 0 0 2 0 0 0 0 2 0 2 0 0 0 0 0 0 0 0 0 13
SANDVIK ROCK TOOLS, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 1 2 1 2 1 0 0 1 1 0 0 0 1 0 0 0 0 0 13
DIAMOND PRODUCTS INTERNATIONAL, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2 4 1 3 0 0 0 0 0 0 12
LONGYEAR COMPANY 0 0 0 0 0 1 1 1 0 0 0 0 2 0 0 0 0 0 0 0 3 0 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 12
NOBLE DRILLING SERVICES, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 2 1 0 1 2 2 1 0 12
ROBBINS COMPANY 0 0 0 0 1 0 1 1 0 0 0 1 1 1 1 0 0 0 1 0 0 0 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 12
UNITED STATES OF AMERICA, DEPARTMENT OF ENERGY 0 0 0 1 1 0 0 1 1 1 0 0 0 0 2 0 0 0 0 0 1 0 0 0 0 1 0 0 1 0 0 0 0 2 0 0 0 0 0 0 12
ABB VETCOGRAY INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 0 1 0 0 1 1 2 1 0 0 1 0 0 0 11
CHEVRON RESEARCH & TECHNOLOGY CO. 2 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 4 2 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11
REED TOOL COMPANY LIMITED 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 4 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 11
BOWEN TOOLS, INC. 0 0 3 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 2 2 0 0 0 0 0 0 0 0 0 0 0 0 10
DIGITAL CONTROL INCORPORATED 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 4 1 3 1 0 0 0 0 0 10
ELECTRIC POWER RESEARCH INSTITUTE, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 3 1 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 10
HYDRIL COMPANY L.P. 0 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 1 0 1 0 0 0 10
NATIONAL-OILWELL, L.P. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 1 10
PATHFINDER ENERGY SERVICES, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 3 4 10
RICHMOND MANUFACTURING COMPANY 0 0 2 1 0 1 0 3 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10
SMF INTERNATIONAL 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 1 0 0 0 0 0 0 0 0 0 1 0 1 0 1 1 0 1 0 10
TAMROCK OY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 2 0 2 1 1 0 0 0 0 0 0 0 0 0 10
TERRA AG FUR TIEFBAUTECHNIK 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 2 0 2 1 1 1 0 1 0 1 0 0 0 0 0 10
VAREL MANUFACTURING COMPANY 0 0 0 0 1 0 0 0 0 0 0 0 2 0 0 0 1 1 2 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 10
WESTERN ATLAS INTERNATIONAL, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 2 2 2 0 2 1 0 0 0 0 0 0 0 0 10
WIRTH MASCHINEN-UND BOHRGERATE-FABRIK GMBH 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 3 0 0 0 0 0 0 10
ANDERGAUGE LIMITED 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 3 0 0 1 0 1 9
DRILEX SYSTEMS, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 1 3 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
ENGINEERING ENTERPRISES, INC. 0 0 0 0 0 0 0 2 2 0 0 0 4 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
FANSTEEL INC. 0 0 0 0 0 1 0 0 0 1 1 3 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
OY TAMPELLA AB 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 1 0 1 0 1 2 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
SANDVIK TAMROCK OY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 2 0 1 1 1 0 9
TRACTO-TECHNIK GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 3 2 2 9
VARCO INTERNATIONAL, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 3 1 1 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 9
WALKER-NEER MFG. CO., INC. 0 2 0 1 0 0 0 0 1 1 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9
ATLAS COPCO CRAELIUS AB 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 2 0 0 0 2 1 0 0 0 8
CITIES SERVICE COMPANY 0 0 0 0 0 5 2 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8
DEN NORSKE STATS OLJESELSKAP A.S. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0 0 0 3 0 0 0 1 1 0 0 0 0 8
FLOWMOLE CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8
GLOBAL MARINE PERFORMANCE, INC. 1 1 2 2 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8
INSTITUT GORNOGO DELA SIBIRSKOGO OIDELENIA AKADEMII NAUK SSS 0 0 0 2 1 0 0 0 0 0 2 0 0 0 1 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8
TESCO CORP 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 4 0 2 8
UNIROC AKTIEBOLAG 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 2 1 0 0 0 0 2 0 0 0 0 0 0 0 0 0 8
AMERICAN COLDSET CORPORATION 0 0 2 0 0 1 1 0 0 0 1 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
APS TECHNOLOGY, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 0 2 2 7
BAUER MASCHINEN GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 4 1 7
BECOR WESTERN, INC. 0 0 0 0 4 0 0 1 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
CANADIAN DOWNHOLE DRILL SYSTEMS INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 2 1 1 1 0 0 0 0 0 7
DENNIS TOOL COMPANY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 4 0 1 0 0 0 0 0 0 0 0 0 0 7
GARDNER-DENVER COMPANY 1 0 1 1 1 0 0 1 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
GTE LABORATORIES, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
INCO LIMITED 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 1 0 0 0 0 0 1 1 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 7
J. H. FLETCHER & CO., INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 5 7
OTIS ENGINEERING CORPORATION 0 0 0 0 0 0 0 0 1 2 1 0 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
PENGO CORPORATION 0 1 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 7
ROCK BIT INTERNATIONAL, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 1 0 0 0 0 0 2 1 0 0 0 0 0 0 7
SERVCO COMPANY, A DIVISION OF SMITH INTERNATIONAL, INC. 0 0 1 1 1 1 0 0 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
SOLETANCHE SOCIETE ANONYME 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 2 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
TONE BORING COMPANY LIMITED 0 1 0 0 3 0 0 1 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
TOTAL 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 0 0 0 1 1 1 0 0 0 0 0 0 0 0 7
TRI-STATE OIL TOOL INDUSTRIES, INC. 0 0 0 0 0 1 0 0 0 1 0 2 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7
U.S. SYNTHETIC CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 3 1 2 0 0 0 0 0 0 0 7
UNITED STATES OF AMERICA, ARMY 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 2 1 0 0 0 0 0 0 0 7
UNITED STATES OF AMERICA, DEPARTMENT OF THE INTERIOR 0 1 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 7
VAREL INTERNATIONAL, LTD. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 5 1 0 0 7
VECTOR MAGNETICS 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 2 2 1 0 0 1 0 0 0 0 0 0 0 7
VETCO GRAY INC 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 0 0 7
"ALWAG" TUNNELAUSBAU GESELLSCHAFT M.B.H 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 4 1 6
ANADRILL INCORPORATED 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
AT&T CORP. 1 2 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
BLACK & DECKER INC. 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 1 0 0 0 0 0 1 1 0 6
BOART LONGYEAR INTERNATIONAL HOLDINGS, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 0 1 1 0 0 0 0 0 6
CARMET COMPANY 0 0 2 0 0 0 0 0 2 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
DHT TECHNOLOGIES, LTD. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 0 0 0 0 0 0 0 6
DIAMANT BOART SOCIETE ANONYME 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
DIAMOND OIL WELL DRILLING COMPANY 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
FISCHERWERKE ARTUR FISCHER GMBH & CO. KG 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
HARNISCHFEGER TECHNOLOGIES, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 1 1 0 0 0 0 0 6
INTELLISERV, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 5 0 6
OWEN OIL TOOLS, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 3 0 0 1 0 0 0 0 0 0 0 6
ROBERT BOSCH GMBH 0 0 0 0 0 0 0 0 0 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 6
SALEM TOOL COMPANY 0 0 0 0 1 0 2 1 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
SHELL OFFSHORE INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 0 1 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 6
SIMULPROBE TECHNOLOGIES, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 3 1 0 0 0 0 0 0 0 0 6
SMITH INDUSTRIES INTERNATIONAL INC. 3 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
STANDARD OIL CORPORATION (INDIANA) 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 4 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
SUMITOMO METAL MINING COMPANY LIMITED 0 0 0 1 1 0 1 1 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
TELECO OILFIELD SERVICES INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
TEXAS DYNAMATICS INC. 0 0 0 0 0 0 2 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
TIGRE TIERRA, INC. 0 0 0 0 0 1 3 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
UNDERGROUND TECHNOLOGIES, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
WESTERN ROCK BIT CO., LTD. 0 0 0 0 0 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6
BAUER SPEZIALTIEFBAU GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 2 0 2 0 0 0 0 0 0 0 5
BJ SERVICES CO 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 2 1 0 1 0 0 5
BOYLES BROS. DRILLING COMPANY 3 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
BYRON JACKSON INC. 1 1 2 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
CAMERON IRON WORKS, INC. 3 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
CHERRINGTON CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
COMPAGNIE DU SOL 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 3 1 0 0 5
CUMMINS ENGINE CO., INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
DELMAG-MASCHINENFABRIK REINHOLD DORNFELD 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 5
FMC CORPORATION 0 1 0 0 1 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
GAS TECHNOLOGY INSTITUTE 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 2 0 0 5
GEBRUDER BUHLER AG 0 2 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
HALLIBURTON LOGGING SERVICES, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
HARD ROCK DRILLING & FABRICATION, L.L.C. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0 0 0 0 5
HOUSTON ENGINEERS, INC. 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 5
JAPAN NATIONAL OIL CORPORATION 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 2 1 0 0 0 0 5
JET RESEARCH CENTER, INC. 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
JOY MANUFACTURING COMPANY 0 0 0 0 0 1 0 1 0 1 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
LAWRENCE MANUFACTURING COMPANY 1 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
MARATHON OIL COMPANY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 1 0 0 0 0 1 1 0 0 0 0 0 0 5
METHANE DRAINAGE VENTURES 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
MOBILE DRILLING COMPANY INC. 0 0 0 1 0 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
NORTON COMPANY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
NUMA TOOL COMPANY 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 2 0 0 0 1 0 0 0 0 5
PATTON CONSULTING, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 5
PRECISION DRILLING TECHNOLOGY SERVICES GROUP INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0 0 0 0 0 5
RAPIDEX, INC. 0 0 0 0 0 0 1 2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
REEDHYCALOG, L.P. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 2 0 5
SLIMDRIL INTERNATIONAL, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 5
SMART DRILLING AND COMPLETION, INC. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 0 2 0 0 0 5
TECHMO ENTWICKLUNGS-UND VERTRIEBS GMBH 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 0 1 1 0 0 0 5
TRW INC. 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5
TURMAG TURBO-MASCHINEN-AG NUSSE & GRAFER 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5



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