| Patents for G04D 9 - Demagnetising devices (3) | |
|---|---|
| 09/2011 | |
| 09/28/2011 | CN201993595U 机械手表退磁器 Mechanical watches demagnetiser |
| 08/1999 | |
| 08/04/1999 | CN2331987Y Multifunction watch rapair instrument with computer testing device |
| 11/1992 | |
| 11/04/1992 | CN2121044U Demagnetizer for watch |