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| Item No. | Model No. | Specification | Uses | 
| 1509 | JCG-1 | Four-Section Overall Length: 2.3m  | Apply to calculating conductor altitude and line crossed crossing distance  | 
| 1510 | JCG-2 | Six-Section Overall Length: 5.5m  | |
| 1511 | JCG-3 | Seven-Section Overall Length: 10.5m  | |
| 1512 | JCG-4 | Eight-Section Overall Length: 12m  | |
| 1513 | JCG-5 | Nine-Section Overall Length: 13.5m  | |
| 1514 | JCG-6 | Ten-Section Overall Length: 15m  | 
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