| 1. | Technical specification for auxiliary fans used for mine
|
| 2. | Methods to reducing noise produced by auxiliary fan in mine
|
| 3. | Improvement of model fd contra - rotating auxiliary fan
|
| 4. | Technical specification for contrarotating auxiliary fans
|
| 5. | Using auxiliary fan to treat gas in upper corner
|
| 6. | Test study of two - speed contra - rotating auxiliary fan
|
| 7. | Development of auto - shifting device of auxiliary fan
|
| 8. | Application of intelligent double - auxiliary fan special switch
|
| 9. | Automatic rotate device of auxiliary fan
|
| 10. | Design and application of auto - shifting device of auxiliary fan
|
