 |
| |||
| audio-visual | |||
| Bild-Ton: 51 phrases in 9 subjects |
| Communications | 2 |
| Computers | 2 |
| Electronics | 1 |
| General | 1 |
| Industry | 4 |
| Optics branch of physics | 1 |
| Patents | 34 |
| Radio | 4 |
| Sound recording | 2 |
|
| |||
| audio-visual | |||
| Bild-Ton: 51 phrases in 9 subjects |
| Communications | 2 |
| Computers | 2 |
| Electronics | 1 |
| General | 1 |
| Industry | 4 |
| Optics branch of physics | 1 |
| Patents | 34 |
| Radio | 4 |
| Sound recording | 2 |