1960s emphasized the S/Line's physical styling and size, as often as they did its performance. Collins continued to improve the S/Line, first introducing the S-2, then the S-3 units, the 75S-3 (and -3A, -3B and -3C) receiver, and the 32S-3 and -3A transmitters. The -3A and -3C units were identical to the -3 and -3B units, respectively, except they provided an extra set of heterodyne oscillator crystals, enabling them to cover extra bands – useful for military, amateur and MARS operation, where operation just outside the regular amateur bands was necessary. Among amateur radio operators, the S/Line established its reputation as perhaps the most solidly engineered equipment available, and the most costly. As a result, S/Line equipment, and the A-Line and other predecessors, are restored, prized, and operated on the air by collectors today. Collins continued to produce the S/Line well into the late 1970s, and after its acquisition by Rockwell. In 1978, with the move to solid-state design, the S/Line came to an end after a two-decade production run. The KWM-380 transceiver was introduced the next year, a break with the past both in its use of transistors and digital technology, and its styling. It was Collins' final entry in the amateur radio market until it was discontinued in the mid-1980s. Computers In the 1960s, the company designed and sold C-System computerized message-switching equipment, built an intranet, and began implementing computer storage of design data for circuit boards and assemblies. They had a goal of automating all functions from parts ordering and inventory to factory scheduling to generation of maintenance provisioning. With products technically successful and far ahead of their time in many respects, Mr. Collins continued to invest in development at a rate that could not be supported by sales when a downturn occurred, and began to have financial problems. Network Transmission Systems In 1991, Rockwell sold its Richardson, Texas-based Network Transmission Systems division to Alcatel. Acquisitions In 2008, Rockwell Collins acquired Athena Technologies for million (equivalent to $million in ). ARINC Acquisition In August 2013, Rockwell Collins announced the agreement to purchase ARINC. On December 23, 2013, Rockwell Collins announced it had completed its acquisition of ARINC for billion (equivalent to $billion in ). The purchase of ARINC allowed Rockwell Collins to shift their balance in commercial aviation. B/E Aerospace Acquisition In April 2017, Rockwell Collins entered the aircraft cabin interiors market through the acquisition of B/E