sell the machines for the budding phonograph marketplace. The Volta Graphophone Company then merged with American Graphophone, which itself later evolved into Columbia Records. A coin-operated version of the Graphophone, , was developed by Tainter in 1893 to compete with nickel-in-the-slot entertainment phonograph demonstrated in 1889 by Louis T. Glass, manager of the Pacific Phonograph Company. The work of the Volta Associates laid the foundation for the successful use of dictating machines in business, because their wax recording process was practical and their machines were durable. But it would take several more years and the renewed efforts of Edison and the further improvements of Emile Berliner and many others, before the recording industry became a major factor in home entertainment. Disc vs. cylinder as a recording medium Discs (that aren't re-recordable) are not inherently better than cylinders at providing audio fidelity. Rather, the advantages of the format are seen in the manufacturing process: discs can be stamped, and the matrixes to stamp disc can be shipped to other printing plants for a global distribution of recordings; cylinders could not be stamped until 1901–1902, when the gold moulding process was introduced by Edison. Through experimentation, in 1892 Berliner began commercial production of his disc records and "gramophones". His "gramophone record" was the first disc record to be offered to the public. They were in diameter and recorded on one side only. Seven-inch (17.5 cm) records followed in 1895. Also in 1895 Berliner replaced the hard rubber used to make the discs with a shellac compound. Berliner's early records had very poor sound quality, however. Work by Eldridge R. Johnson eventually improved the sound fidelity to a point where it was as good as the cylinder. Dominance of the disc record In the 1930s, vinyl (originally known as vinylite) was introduced as a record material for radio transcription discs, and for radio commercials. At that time, virtually no discs for home use were made from this material. Vinyl was used for the popular 78-rpm V-discs issued to US soldiers during World War II. This significantly reduced breakage during transport. The first commercial vinylite record was the set of five 12" discs "Prince Igor" (Asch Records album S-800, dubbed from Soviet masters in 1945). Victor began selling some home-use vinyl 78s in late 1945; but most 78s were made of a shellac compound until the 78-rpm format was completely phased out. (Shellac records