A true mirror of sound : Bettini micro-phonograph, micro-diaphragms for phonograph and graphophone, Bettini celebrated "opera musical records" and autograph-records of world famous artists (1900)
Bettini Phonograph Laboratory · New York : Bettini Phonograph Laboratory · leaf 4
ducer P, Recorder r, and the Columbia Recorder with the special Recording arm V, can be applied to the Edison Electric and Triple Spring Motor, Home and Standard Phonographs ; also to the Edison Concert or Graphophone Grand by using the following Sleeve Speaker Arms corresponding to each of these… … ($6.00) SLEEVE SPEAKER ARM (S) ($4.00) For Edison Concert Phonograph or Graphophone Grand. For Edison Standard Phonograph. N. B.—The Bettini Arms a and B are not provided with back- rod sleeve, as they are designed to be used with the ordinary phonograph or Columbia Grand back-rod sleeve, which may…
