Cox Communications, 6124 E 30th St N, Tulsa, OK 74115, US

Hemphill Corporation, located in Tulsa, Okla., manufactures and installs towers and related accessories for the telecommunications industry. Its services include product development, planning, engineering, design, manufacturing, logistics, construction, and installation. The company supplies a variety of products, including guyed towers, self-support towers, monopoles, platforms, face and leg antenna mounts and water tank structures. It also finances, develops, manages and maintains multi-tenant tower facilities. Hemphill was founded in 1957 and began tower site development in 1983.