Search for all of "equipment", all of "Boulder Dam Service Bureau", all of "Drilling Jumbos"

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1 Object thumbnail
Construction in diversion tunnel -- Hoover Dam View of the drilling jumbo working in one of the diversion tunnels during the construction of Hoover Dam.
2 Object thumbnail
Construction workers in diversion tunnel, Hoover Dam site Shows construction workers posing on the drilling jumbo inside a diversion tunnel during the construction of Hoover Dam. Other men are standing on the floor of the tunnel looking up at the jumbo. Electric lights illuminate the tunnel.

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