| filt | |
| industr. | pressed felt; wool felt |
| industr. construct. | fine felt; felt |
| filter | |
| el. | frequency filter; a.c.filter |
| environ. | dust arrester; dust filter; screen; strainer |
|
spin : 21 phrases in 8 subjects |
| Astronautics | 1 |
| Business | 3 |
| Earth sciences | 2 |
| General | 1 |
| Hobbies and pastimes | 1 |
| Mechanic engineering | 1 |
| Physical sciences | 7 |
| Transport | 5 |