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Drill jumbos
Drill jumbos
Drill jumbos
1993
Article (Journal)
English
Seven-drill "Jumbos" make short work of west rock highway tunnel
Engineering Index Backfile | 1949
|Werkseinweihung: >>Jumbos<< sind im Anmarsch
Online Contents | 1996
Train of jumbos handles Niagara conduit forms
Engineering Index Backfile | 1959
Will computer controlled jumbos take over at the face?
Tema Archive | 1984
|Jumbos and Loaders busy in Sedrun at the GBT
British Library Online Contents | 2004