DIGITAL KEY TELEPHONE SYSTEM
ROBERTSON, DAVID J, MAGINLLEY, RONALD J, SMELTERS. PAUL J, IRWIN, GEORGE F
Year of Publication 08.03.1997
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Year of Publication 08.03.1997
Patent
DIGITAL KEY TELEPHONE SYSTEM
SMELTERS, PAUL J, ROBERTSON, DAVID J, CHAPMAN, ALAN S.J, MAGINLEY, RONALD J, IRWIN, GEORGE F
Year of Publication 30.06.1992
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Year of Publication 30.06.1992
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Digital key telephone system
MAGINLEY; RONALD J, SMELTERS; PAUL J, ROBERTSON; DAVID J, IRWIN; GEORGE F
Year of Publication 10.10.1989
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Year of Publication 10.10.1989
Patent