Perforations oblongues et carrées
| OB20 | OB25 | |
| Ø1.5 x 7mm, 20% de section libre | Ø2.0 x 14mm, 25% de section libre | |
| OB50 | S.1147 | |
| Ø4.5 x 21mm, 50% de section libre | *11.0mm, 47% de section libre |
| OB20 | OB25 | |
| Ø1.5 x 7mm, 20% de section libre | Ø2.0 x 14mm, 25% de section libre | |
| OB50 | S.1147 | |
| Ø4.5 x 21mm, 50% de section libre | *11.0mm, 47% de section libre |