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Contact Supplier| Ratio | Effective Rotation | Useful Rotation | 2 Contacts Model | 4 Contacts Model |
|---|---|---|---|---|
| 48:1 | 42 | 40 | GRLS/48/2SH | GRLS/48/4SH |
| 60:1 | 52 | 50 | GRLS/60/2SH | GRLS/60/4SH |
| 96:1 | 84 | 80 | GRLS/96/2SH | GRLS/96/4SH |