| amplifier | |
| gen. | Verstärker |
| el. | Verstaerker; Verstärkervorrichtung |
| meas.inst. | Hauptverstärker; Verstärker |
| tech. | Lautverstaerker; Messverstaerker |
| transp. | Verstärker |
| transp. construct. | Kraftverstärker |
| amplifiers | |
| gen. | Tonverstärker |
|
Doherty : 11 phrases in 3 subjects |
| Natural resourses and wildlife conservation | 2 |
| Ornithology | 6 |
| Technology | 3 |