Loudspeaker (Jan-Aug 1931)

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cl ^Modernize Tour TOIVERS w,thtbe Knowles Rear Shutter Note Ri&id Construction for POWER’S PROJECTORS . . . Shutter adjustment extremely simple, having only two parts — shutter can be set while running. Shutter blades have air vanes, which create a rapid circulation of air, therefore making a very efficient heat dissipator. The rear shutter is no longer an experiment, but is now a necessity to modern day projection. The attachment permits the use of any sound system made. In case of emergency repairs to head mechanism, the entire assembly may be removed. PRICE RIGHT— INVESTIGATE SEE IT AT Your Local Dealer’s Display Room OR WRITE DIRECT TO G. L. KNOWLES, 1927 West 84th Street, Los Angeles, Calif.