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http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1980-01-supplement.pdf|Post-Office-Electrical-Engineers-Journal-1980-01-supplement.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1980-01-supplement.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1980-10-supplement.pdf|Post-Office-Electrical-Engineers-Journal-1980-10-supplement.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1980-10-supplement.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1980-07-supplement.pdf|Post-Office-Electrical-Engineers-Journal-1980-07-supplement.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1980-07-supplement.jpg| http://www.americanradiohistory.com/UK/POEEJ/70s/Post-Office-Electrical-Engineers-Journal-1979-10.pdf|Post-Office-Electrical-Engineers-Journal-1979-10.pdf||http://www.americanradiohistory.com/UK/POEEJ/70s/Thumb/Post-Office-Electrical-Engineers-Journal-1979-10.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1980-04-supplement.pdf|Post-Office-Electrical-Engineers-Journal-1980-04-supplement.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1980-04-supplement.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1980-01.pdf|Post-Office-Electrical-Engineers-Journal-1980-01.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1980-01.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1980-07.pdf|Post-Office-Electrical-Engineers-Journal-1980-07.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1980-07.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1981-01-supplement.pdf|Post-Office-Electrical-Engineers-Journal-1981-01-supplement.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1981-01-supplement.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1980-04.pdf|Post-Office-Electrical-Engineers-Journal-1980-04.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1980-04.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1981-04-supplement.pdf|Post-Office-Electrical-Engineers-Journal-1981-04-supplement.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1981-04-supplement.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1981-07-supplement.pdf|Post-Office-Electrical-Engineers-Journal-1981-07-supplement.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1981-07-supplement.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1980-10.pdf|Post-Office-Electrical-Engineers-Journal-1980-10.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1980-10.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-index-vol-73-1980.pdf|Post-Office-Electrical-Engineers-Journal-index-vol-73-1980.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-index-vol-73-1980.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1981-01.pdf|Post-Office-Electrical-Engineers-Journal-1981-01.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1981-01.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1982-01-supplement.pdf|Post-Office-Electrical-Engineers-Journal-1982-01-supplement.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1982-01-supplement.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1981-04.pdf|Post-Office-Electrical-Engineers-Journal-1981-04.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1981-04.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-index-vol-74-1981.pdf|Post-Office-Electrical-Engineers-Journal-index-vol-74-1981.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-index-vol-74-1981.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1981-07.pdf|Post-Office-Electrical-Engineers-Journal-1981-07.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1981-07.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1982-01.pdf|Post-Office-Electrical-Engineers-Journal-1982-01.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1982-01.jpg| http://www.americanradiohistory.com/UK/POEEJ/80s/Post-Office-Electrical-Engineers-Journal-1981-10.pdf|Post-Office-Electrical-Engineers-Journal-1981-10.pdf||http://www.americanradiohistory.com/UK/POEEJ/80s/Thumb/Post-Office-Electrical-Engineers-Journal-1981-10.jpg|