| 21. | The photophone was a precursor to the fiber-optic communication systems which achieved popular worldwide usage in the 1980s.
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| 22. | Three brands of optical sound-on-film technology emerged in the 1920s : Photofilm, Photophone and Movietone.
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| 23. | Its master patent was issued in December 1880, many decades before the photophone's principles came into popular use.
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| 24. | The photophone was a precursor to the fiber-optic communication systems that achieved worldwide popular usage starting in the 1980s.
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| 25. | In its ultimate electronic form, the photophone receiver used a simple selenium cell at the focus of a parabolic mirror.
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| 26. | The photophone was a precursor to the fiber-optic communication systems which achieved popular worldwide usage starting in the 1980s.
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| 27. | Warner Bros . and First National stopped recording directly to disc and switched to Photophone sound-on-film recording.
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| 28. | *the Photophone an optical, wireless telephone, the precursor to fiber-optic communications ( February 1880 );
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| 29. | "This Thing Called Love " was recorded in RCA Photophone and featured a two-tone Technicolor sequence.
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| 30. | In 1927 and 1928, Hollywood expanded its use of sound-on-film systems, including Fox Movietone and RCA Photophone.
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