In one embodiment, an apparatus cascades groups of serialized data streams through devices, and performs operations based on information communicated therein. Coaxial probe structures are fabricated by the methods described providing a high density coaxial probe. The system herein requires that either a clinician or vendor begin the process by logging on the internet web site and agree to the user agreements as well as HIPAA compliance measures. An alternative embodiment provides successive beamforming for near optimal precoding selection with medium complexity. The cam frames undergo a sliding displacement in a direction along which the pairs of idler rollers and drive rollers are arranged in coordination with opening and closing of the feeder cover.