How do overhead cranes work?

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Tags

1. #called
2. #trolley
3. #moving
4. #under
5. #running
6. #backward
7. #hoist
8. #cover
9. #headroom
10. #wheels
11. #beams
12. #overhead
13. #increased
14. #which
15. #cranes
16. #moves
17. #forward
18. #incorporate
19. #bridge
20. #crane
21. #along
22. #rectangular
23. #typically