Dresser Atlas is a provider of oil field and factory automation services, formed in 1968 through the merger of PGAC and Lane Wells Company. In 1987, the company merged with Western Geophysical

Western Geophysical

Western Geophysical was a company founded in California in 1933 by Henry Salvatori for the purpose of using reflection seismology to explore for petroleum....

 to form Western Atlas

Western Atlas

Western Atlas was formed in 1987 through the merger of Western Geophysical and Dresser Atlas. The resulting company was a joint venture of Litton and Dresser Industries until it was spun off as a publicly traded company in 1994....

, and in 1998, Western Atlas was acquired by Baker Hughes, and, since then, was named Baker Atlas.

Providing oil field and factory automation services worldwide, Western Atlas Inc. was the world's largest provider of seismic data to the oil industry and was the leading designer of assembly lines for US vehicle manufacturers. The company was spun off from Litton Industries late in 1993. Sales during 1994, its first year of operation as an independent, topped $2 billion. About 75 percent of those receipts were garnered from foreign operations.

Dresser Atlas was a division of Dresser Industries

Dresser Industries

Dresser Industries was a multinational corporation headquartered in Dallas, Texas, United States, which provided a wide range of technology, products, and services used for developing energy and natural resources...

 Inc.

Dresser Atlas provided open-hole petrophysics

Petrophysics

Petrophysics is the study of the physical and chemical properties that describe the occurrence and behavior of rocks, soils and fluids . Petrophysics mainly studies reservoirs of resources, including ore deposits and oil or natural gas reservoirs...

 and oilfield completion services around the world in competition with Schlumberger

Schlumberger

Schlumberger Limited is the world's largest oilfield services company. Schlumberger employs over 110,000 people of more than 140 nationalities working in approximately 80 countries...

and others.

Corporate headquarters in Dallas TX, offices in Oklahoma City, ...
US field bases included: Olney IL, Big Rapids MI, Houston TX, Woodward OK, Elk City OK, Baton Rouge LA, Rock Springs WY, ...
Overseas operations: main offices London, training base: Bremen Germany;
bases in Dhahran Saudi Arabia, Stavanger Norway, Maracaibo Venezuela, Kuwait, Nigeria, ...

... many more bases (not sure if Wikipedia users interested in this sort of detail, there is a lot more).