The gross sales diaries were translated into punch cards so the information could possibly be interpreted by a pc. A pc then compiled the chart on Monday, and the BBC have been knowledgeable of the Top 50 on Tuesday in time for it to be introduced on Johnnie Walker’s afternoon show.
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Record Retailer and the BBC commissioned the British Market Research Bureau (BMRB) to compile charts, beginning 15 February 1969. The BMRB compiled its first chart from postal returns of sales logs from 250 report shops. The sampling cost roughly £fifty two,000; outlets were randomly chosen from a pool of approximately 6,000, and submitted figures for sales taken as much as the shut of trade on Saturday.
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