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The file is generated at assorted events, including consumer shows (car, boat, wedding, outdoors, etc.), office buildings, sporting events and shopping centre tours. This list owner works in conjunction with the event organizer to create a "community" of attendees, with data collection at source (opt-in) and follow-up communication through email and their web site. Below are numbers for the file, representing the last 12 months collected data (they have archived several years and we might bang last 2-3 years of data against the white page data to establish records from that timeframe that are still at the same location (home address).
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