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Vinyl was invented in the 1870's, not patented until a practical production method was developed almost 40 years later, and not considered a useful material commercially until perfected by the Goodrich Company in the 1920's. Edison's phonograph used a cylinder with a foil like tin covering.
It is unclear when he started to try his hand at invention, but on June 11, 1881, he filed his first request for a patent. The invention was a roll film holder. Flexible roll film had not yet been invented, but Houston anticipated that one day it would be.