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Journal of the Society of Motion Picture Engineers ( Volume: 21, Issue: 3, September 1933)
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- 1 Olson H. F. : “Recent Developments in Theater Loud Speakers of the Directional Baffle Type,” J. Soc. Mot. Pict. Eng. , XVIII (May, 1932 ), No. 5 , p. 571 .EXTERNAL
- 2 Olson H. F. : “The Ribbon Microphone,” J. Soc. Mot. Pict. Eng. , XVI (June, 1931 ), No. 6 , p. 695 .EXTERNAL