| Name | Last modified | Size | Description | |
|---|---|---|---|---|
| Parent Directory | - | |||
| megaphone_2.jpg | 2015-10-31 16:00 | 550K | ||
| cropped_megaphone.jpg | 2015-10-18 09:51 | 12K | ||
| SpeakerInventors.jpg | 2011-03-26 21:02 | 211K | ||
| Megaphone.jpg | 2013-09-08 16:31 | 13K | ||
| Firstamp.tiff | 2013-09-08 19:30 | 269K | ||
| Firstamp.png | 2013-09-29 13:45 | 36K | ||
| FirstUseOfPublicAddr..> | 2011-03-26 21:08 | 525K | ||
| FirstRecording1850.j..> | 2012-06-25 17:52 | 476K | ||
| FirstRecording1850.jpg | 2012-08-06 15:12 | 474K | ||
| FirstPublicAddressSy..> | 2011-03-26 21:12 | 187K | ||
| FirstMicrophoneUsedB..> | 2011-03-26 21:09 | 146K | ||
| CloseUpSign.jpg | 2011-03-26 21:09 | 153K | ||
| CloseUpOfMic.jpg | 2011-03-26 21:09 | 153K | ||
| BirthplaceOfDynamicS..> | 2011-03-26 21:01 | 329K | ||
| Berlin1912VacTubeAmp..> | 2013-09-29 13:29 | 1.9M | ||
