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Tel-Instrument Electronics Corp. designs, manufactures, and sells avionics test and measurement instruments for the commercial air transport, general aviation, and government/military aerospace and defense markets in the United States and internationally. It operates in two segments, Avionics Government and Avionics Commercial. The company provides instruments to test, measure, calibrate, and repair a range of airborne navigation and communication equipment. Its products include TS-4530A and T-4530i, an identification friend or foe test sets; and T-47/M5, a dual crypto test set. The company also offers AN/USM-708 and AN/USM-719 communications/navigation radio frequency avionics flight line testers; SDR/OMNI, an avionics test set; and Lockheed Martin MADL test set, a secure communications radio for the F-35. It serves customers directly or through distributors. The company was incorporated in 1947 and is headquartered in East Rutherford, New Jersey.

Zoom Telephonics, Inc., together with its subsidiary, designs, produces, markets, sells, and supports Internet access and other communications-related products in North America and internationally. It provides cable modems and gateways, multimedia over coax adapters, digital subscriber line modems, mobile broadband modems and routers, dial-up modems, local area network products, mobile broadband sensors, wireless and wired networking equipment, phone jacks and AC power adapters, and language-related specifics. The company sells its products through retailers and distributors, Internet and telephone service providers, value-added resellers, PC system integrators, and original equipment manufacturers, as well as through a direct sales force and independent sales agents. ZoomTelephonics, Inc. was founded in 1977 and is headquartered in Boston, Massachusetts.