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[ Manufacturer ]Main business are Digital programme-controlled telephone exchange, Collective telephone
[ Manufacturer Trader ]Main business are Exchange, Photoemissive machine, Light receiver, Coding and decoding system for CATV, Optical amplifier.
[ Manufacturer Trader ]Main business are Programme-controlled telephone exchanger
[ Trader ]Main business are Phone and related equipment.
[ Trader ]Main business are Software, Communication equipment, Electronic products
[ Trader ]Main business are Communication products