Boart Longyear diamond drilling firm; Brainard-Kilman, a maker of civil engineering devices, such as well monitoring and test equipment; and ChemGrout a mfg of cement grouting equipment. Longyear acquired Slope Indicator Company, the nation's largest producer of geotechnical instruments, and Northern Air Supply in 1988, followed by the Campbell Pacific Division in 1989 and WTD Environmental Drilling in 1990. Then in 1994, North Star Drilling Company, specializing in sonic drilling was acquired. On January 2, 1995, Boart International and the Longyear Company officially merged into a single company and changed its name to Boart Longyear Limited. At this point the two companies
Teisserenc de Bort (crater) gigantic Huygens to the southeast, Dawes to the southwest and Janssen to the northwest. Further north of the crater is a valley known as Locras Valles. A picture below shows dark slope streaks. The darker the streak, the younger it is. Teisserenc de Bort (crater) Teisserenc de Bort is an impact crater on Mars, located in the Arabia quadrangle at 0.4° N and 315.0° W. It measures 119 kilometers in diameter and was named after French meteorologist Léon Teisserenc de Bort (1855–1913). The name was adopted by IAU's Working Group for Planetary System Nomenclature in 1973. The crater are one