CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins86% CONFIDENCEOverall confidence: 86%How well the pin's source and references back up its dates.Weighted average of how firmly 6 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Happened as dated, per the source[1]: "a single telephone call changed the history of London and the United Kingdom forever."London's cylindrical BT Tower (originally the GPO Tower) began carrying live microwave telecommunications traffic in 1965, its concrete core partly designed to survive a nuclear blast.
≈$3.2M
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