Cardiac Assist Technologies

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.

Operational for over 45 years and located in Pittsburgh, Pa., Extrel CMS LLC is one of the world's leading manufacturers of research and process mass spectrometers, Residual Gas Analyzers (RGA's), quadrupole mass spectrometry systems and components. It is a provider of quadrupole mass spectrometry solutions. The company offers products, such as custom systems and components, electronics, gas analysis systems, ionizers and ion optics, quadrupole mass spectrometers and residual gas analyzers, etc. Extrel CMS LLC provides a broad range of spare parts, repairs and upgrades services. Its applications include Pharmaceutical/Biotechnology, Materials Research, Energy/Biofuels, Semiconductor, etc. the company operates in clusters/biomolecules/nanoparticles, energy/biofuels, environmental/atmospheric, materials research, metals production, and other markets.