| Date | Symbol | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|---|
| 1997-11-12 | MASK.N0000 | 45.750 | 45.750 | 38.000 | 40.500 | 465 |
| 1997-11-11 | MASK.N0000 | 49.000 | 49.000 | 45.750 | 46.250 | 512 |
| 1997-11-10 | MASK.N0000 | 45.500 | 50.000 | 45.500 | 49.000 | 920 |
| 1997-11-07 | MASK.N0000 | 41.250 | 44.500 | 41.000 | 43.500 | 1027 |
| 1997-11-06 | MASK.N0000 | 37.500 | 44.750 | 37.000 | 40.500 | 1929 |
| 1997-11-05 | MASK.N0000 | 30.000 | 38.000 | 30.000 | 37.250 | 3615 |