1892 -

"Oil Well Engineering" acquires Continental Tube Works in Pittsburgh

1902 -

1920 -

National acquires Union Tool

1928 -

National purchases 1/2 interest in Oil Well Engineering

1928 -

National acquires Superior Engine Company

1929 -

Oilwell acquires Wilson-Snyder Manufacturing Corp of Pittsburgh

1930 -

United States Steel acquires Oil Well. Oil Well becomes the Oilwell Division

1940 -

National acquires Central Tube Company

1944 -

Oilwell Division acquires Witte Engine Works

1945 -

Oilwell Division acquires Neilsen Pump Company

1975 -

National Supply buys remaining shares of Oil Well Engineering

1978 -

National acquires PAR Industries

1978 -

National acquires Derrick Service Int'l

1978 -

National acquires Compressor Pump and Engine

1979 -

National acquires Baylor

1979 -

National acquires small oilfield services company in Oklahoma City and calls it National Chemicals

1980 -

National purchases assets in Grenco Corporation

1981 -

National Supply (Armco) acquires Equipetrol, S.A.

1987 -

National Supply merges with USS Oilwell

1989 -

National Oilwell acquires Mission

1997 -

National Oilwell acquired Ross Hill Controls

1997 -

National Oilwell acquired PEP, Inc.

1997 -

National Oilwell acquired Dreco Energy Services Ltd. (Canada)

1998 -

National Oilwell acquired Versatech International Ltd. (Canada)

1998 -

National Oilwell acquired Specialty Tools Ltd. (Scotland)

1998 -

National Oilwell acquired Phoenix Energy Products (Harrisburg, Wooley, M&W, CDI)

1998 -

National Oilwell acquired Roberds -Johnson Industries, Inc.

1998 -

National Oilwell acquired DOSCO (Canada)

1999 -

National Oilwell acquired Dupre’ Supply Company & Dupre’ International, Inc.

1999 -

National Oilwell acquired CE (Continental Emsco) Drilling Products & Wilson Mobile Rig

1999 -

National Oilwell acquired Skytop Brewster Company

2000 -

National Oilwell acquired Republic Supply Company

2000 -

National Oilwell acquired Hitec ASA (Norway)

2000 -

National Oilwell acquired IRI International Corporation

2000 -

National Oilwell acquired Wheatley Gaso Omega

2000 -

National Oilwell acquired Baylor Company

2000 -

National Oilwell acquired Hart Sales Company

2001 -

National Oilwell acquired Maritime Hydraulics (Canada) Ltd.

2001 -

National Oilwell acquired DEMIJ (Rotterdam)

2001 -

National Oilwell acquired Tech Power Controls Co.

2001 -

National Oilwell acquired Rye Supply Company, Inc.

2001 -

National Oilwell acquired Texas Oil Works Supply, Inc.

2001 -

National Oilwell acquired HSI-Houston Scientific International, Inc.

2001 -

National Oilwell acquired AMTEX Pump & Supply

2001 -

National Oilwell acquired Rigquip Division Assets (Noble Drilling U.K. Limited)

2002 -

National Oilwell acquired HAL Oilfield Pump & Equipment (HALCO)

2002 -

National Oilwell acquired Integrated Power Systems

2002 -

National Oilwell acquired STS Oilfield Specialty & Supply, L.L.C.

2002 -

National Oilwell acquired Hydralift ASA

2003 -

National Oilwell acquired LSI Specialty Electrical Products

2003 -

National Oilwell acquired MonoFlo, Inc. (US) & Mono Group (UK)

2003 -

National Oilwell acquired Øgrey Mekaniske Verksted AS (Norway)

2005 -

National Oilwell merges with Varco becoming National Oilwell Varco