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U.S. PATENT AND TRADEMARK OFFICE
Office of Electronic Information Products
Patent Technology Monitoring Division (PTMD)

Patenting In Technology Classes,
Breakout By Organization

Count of 1969 - 2004 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 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 1575
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 27 379
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 15 306
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 0 205
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 9 135
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 92
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 83
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 76
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 75
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 66
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 63
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 58
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 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 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 47
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 43
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 42
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 42
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 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 40
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 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 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 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 34
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 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 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 32
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 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 27
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 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 25
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 23
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 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 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 21
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 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 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 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 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 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 18
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 17
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 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 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 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 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 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 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 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 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 14
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 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 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 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 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 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 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 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 12
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 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 11
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 10
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 10
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 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 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 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 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 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 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 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 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 10
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 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 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 9
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 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 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 9
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 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 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 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 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 8
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 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 8
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 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 7
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 7
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 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 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 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 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 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 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 7
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 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 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 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 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 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 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 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 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 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 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 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 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 7
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 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 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 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 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 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 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 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 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 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 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 6
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 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 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 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 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 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 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 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 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 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 6
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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 5


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