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Digital Voice Systems manufactures electronic components, devices, and software designed to record and process digital audio for storage and transmission. The company's products include vocoder chips and interface boards as well as network devices that convert analog audio to digital formats. Digital Voice's customers use its products to enable such communications applications as digital mobile radio, satellite communications, inflight telephony and aircraft communications, and digital voice recorders.

Displaytech company makes ferroelectric liquid-crystal-on-silicon (FLCoS) microdisplays used as electronic viewfinders to frame, focus, and preview images in camcorders and digital still cameras. Displaytech's microdisplays combine the display device with controller and video interface subcomponents for easier integration into OEM products. Customers include Hewlett-Packard, Hitachi, Victor Company of Japan (JVC), Konica Minolta, Kyocera, Olympus, and Sony.

Dolby Laboratories, Inc. develops and delivers products and technologies for the entertainment industry worldwide. The company offers products and services for content creators, which include encoding products and services for moviemakers, music studios, and video game designers; encoders, decoders, and processors for television producers and broadcasters; and mastering and packaging services for digital cinema business. It also provides encoders and digital audio coding technology for digital video disc producers. In addition, the company offers content distribution products and services, including broadcasting products for terrestrial, cable, and satellite broadcast transmissions; and provides training, broadcast system design expertise, and on-site technical expertise to broadcasters. It licenses its technologies to media software vendors, such as operating system vendors, independent software vendors, and integrated circuit manufacturers, as well as manufacturers of home audio and video products, set top boxes, video game consoles, mobile devices, in-car entertainment systems, and PC manufacturers. Dolby Laboratories sells its products directly to customers, as well as through dealers and distributors.

Dominion Electric Supply distributes electrical products and supplies through nine divisions: commercial lighting, data, electric heat and sensor cable, facility and energy management, government sales, materials, residential lighting, switchgear, and counter sales. Its customers include commercial, government, and retail clients in and around Washington, DC. Dominion Electric has eight locations in the District of Columbia, Maryland, and Virginia.

Douglas Battery makes electricity possible in places where wires would be inconvenient. The company's products include motive power and stationary batteries for forklifts, wheelchairs, portable medical equipment, and even Arctic-condition backup power supplies. Its stationary racking system stacks batteries safely. Pushed by rising costs for fuel and steel and overseas competition, Douglas Battery sold its auto division to rival East Penn Manufacturing in 2005. In early 2010 the company sold its remaining industrial batteries business to EnerSys.

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