Original oil and gas trade vintage ad for CHRISTENSEN DIAMOND PRODUCTS COMPANY. Main office and factory was located at 1937 South Second West, Salt Lake City, UT. When You Need Complete Cores Christensen Diamond Bits and Core Barrels Are the Answer to Your Problem. Shown is an image of a large area of drilling cores laid out. This unique 1962 old oilfield petroleum drilling industry magazine advertisement would display beautifully matted and framed.