What is a plug mill?

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Tags

1. #shell
2. #uniformly
3. #process
4. #pierced
5. #diameter
6. #billet
7. #thickness
8. #rollreduced
9. #outside
10. #hearth
11. #round
12. #furnace
13. #heated
14. #rotary
15. #heating
16. #hollow
17. #piercer
18. #mannesmann
19. #solid