Match the following:
| Haulage Unit | Safety Device |
|---|---|
| P. Friction Winder | 1. Run-away Switch |
| Q. Drum Winder | 2. Lilly Controller |
| R. Direct Rope Haulage | 3. Regenerative Braking |
| S. Endless Rope Haulage | 4. Monkey/Back Catch |
P-1, Q-2, R-3, S-4
P-3, Q-2, R-1, S-4
P-1, Q-3, R-4, S-2
P-2, Q-3, R-1, S-4
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