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Old 17th December 2008, 20:37
G-CPTN G-CPTN is offline  
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Join Date: Sep 2008
Location: Tynedale
Age: 79
Posts: 3,698
I was using those signals in the 1960s (and I didn't invent them . . . ;-)
I've searched t'internet but can't find them documented. Maybe they're secret???
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