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They first pour in the Polyvinyl Chloride pellets into the hopper machine, and then feeds the material into the extruder that presses down and makes it into what they call a Biscuit.
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Vinyl Record went through some material/formatting changes for some years, but in 1901 RCA Victor released the Red Seal Line. It was capable of playing 10 inch, 78 RPM records.
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Commercial Radio started and even by 1921, it had a effect on records and phonograph sales. Records didn't really get there boost until 1921, when Victor's patents on the flat records were defeated. Many independent record companies started to make more records.
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These records were made with Shellac coat. Also these records are still mostly the 78 size, but range from 21-78.
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YES! Even though it's been over 100 years Record sales are still rising, and even in 2020 record sales outsold CDs!! Some people now are trying to relax and pull back from the new streaming music to listen to the old fashioned type way.