| 1. | Kellogg was also the first head of their Photophone development group.
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| 2. | Experiments were also to be conducted on the selenium-celled Photophone.
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| 3. | It and the later RCA Photophone system were interchangeable in most respects.
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| 4. | See RCA Photophone for technical details and lists of the industry adopters.
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| 5. | Bell believed the photophone was his most important invention.
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| 6. | In its initial form, the photophone receiver was also non-electronic.
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| 7. | Bell first demonstrated his Photophone on 3 June 1880.
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| 8. | The re-use of the Photophone brand was relatively short-lived.
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| 9. | It was marketed by RCA ( then a GE subsidiary ) as RCA Photophone.
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| 10. | The photophone was similar to a contemporary telephone, except that it used wire circuit.
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