Siemens
1-2Siemens Elm24
 |  | Year: 1924 Type: ribbon One of the first microphones for recording sound to sound movies. |
Siemens SM2
 |  | Year: 30th Type: carbon Very old carbon camera microphone. |
| | Year: 1924 Type: ribbon One of the first microphones for recording sound to sound movies. |
| | Year: 30th Type: carbon Very old carbon camera microphone. |