frá wikipedia.. http://en.wikipedia.org/wiki/Gramophone_record 78 rpm materials Early disc records were made of various materials including hard rubber. From 1897 onwards, earlier materials were largely replaced by a rather brittle formula of 25% shellac, a filler of a cotton compound similar to manila paper, powdered slate, and a small amount of a wax lubricant. The mass production of shellac records began in 1898 in Hanover, Germany, and continued until the end of the 78-rpm format in the...
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