in amusement arcades, saloons and other public places. At that time, a phonograph cost the equivalent of several months' wages for the average worker and was driven by an electric motor powered by hazardous, high-maintenance wet cell batteries. After more affordable spring-motor-driven phonographs designed for home use were introduced in 1895, the industry of producing recorded entertainment cylinders for sale to the general public began in earnest. Blank records were an important part of the business early on. Most phonographs had or could be fitted with attachments for the users to make their own recordings. One important early use, in line with the original term for a phonograph as a "talking machine", was in business for recording dictation. Attachments were added to facilitate starting, stopping, and skipping back the recording for dictation and playback by stenographers. The business phonograph eventually evolved into a separate device from the home entertainment phonograph. Edison's brand of business phonograph was called The Ediphone; see Phonograph cylinder and Dictaphone. Edison also holds the achievement of being one of the first companies to record the first African-American quartet to record: the Unique Quartet. Mass-produced cylinders A significant technological development at the Edison Laboratories was devising a method to mass-produce pre-recorded phonograph cylinders in molds. This was done by using very slightly tapered cylinders and molding in a material that contracted as it set. To Edison's disappointment, the commercial potential of this process was not realized for some years. Most of the regional Edison distributors were able to fill the small early market for recordings by mechanical duplication of a few dozen cylinders at a time. Molded cylinders did not become a significant force in the marketplace until the end of the 1890s, which was when molding was slow and was used only to create pantograph masters. Before using metal cylinders though Edison used paraffin paper. Mass-producing cylinders at the Edison recording studio in New Jersey largely ended the local Edison retailers early practice of producing recordings in small numbers for regional markets, and helped concentrate the USA recording industry in the New York City – New Jersey area, already the headquarters of the nation's Tin Pan Alley printed music industry. In 1902, Edison's National Phonograph Company introduced Edison Gold Moulded Records, cylinder records of improved hard black wax, capable of being played hundreds of times before wearing out. These new records were under the working title