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Crown Castle USA offers is engaged in the engineering, deployment, marketing, operation and leasing of shared wireless communication sites. The company serves wireless carrier, state and federal government agencies and narrowband and broadband data service providers. Crown Castle USA maintains more than 23,500 towers in the United States. The company is a subsidiary of CrownCastle, which provides leasing, zoning, construction and tower rental services. CrownCastle offers a variety of site development and project management services. The company is also engaged in the deployment of distributed antenna systems. CrownCastle manages nearly 1,300 sites in Australia through its subsidiary, Crown Castle Australia.

Black Box Corporation was established in 1976 as a little company called Expandor. It started business by selling connectivity devices, such as the little black boxes that clients need to connect their primary data communications products. In 1977, the first Black Box catalog rolled off the presses. It was six pages long and contained nine products. The company changed the name to Black Box since a majority of the customers began calling the company by its catalog name. The company delivers premier communications solutions throughout the United States and Canada. Its clients range from large enterprise corporations to smaller organizations that the company provides services for, such as voice and Internet protocol telephony solutions, data technologies, customer contact solutions and remanufacture of equipment, as well as technologies for messaging, infrastructure, conferencing and enterprise mobility. Black Box Corporation has a location in Lawrence, Pa.