फ़ोटोफ़ोन: Revision history

From Vigyanwiki

Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.

1 September 2023

30 June 2023

29 June 2023

28 June 2023

21 June 2023

14 June 2023

  • curprev 14:4314:43, 14 June 2023alpha>Indicwiki 53,712 bytes +53,712 Created page with "{{Short description|Device that uses light to transmit speech}} {{About|Alexander Graham Bell and Sumner Tainter's optical phone|the sound-on-film technology|RCA Photophone}}..."