Richardson's handbook of projection (1930)

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1220 HANDBOOK OF PROJECTION FOR slot, and the supplying of these records is a part of the service provided by the Scoredisc Service Corporation, for which, of course, a weekly charge is made. The Scoredisc Service Corporation sends, at the outset, a library of more than one thousand selections on records, -^y ^ S$f|P0RAT\2^ &£" *Jf Figure 441. to which are added such special numbers as may be necessary from time to time. Each one of these records carries a serial number, and when, with any particular production, records are necessary other than those in the library of the exhibitor, they are supplied together