Launching gantry building an overpass

Launching gantry building an overpass.

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Previously:

1934 Aluminum Reduction Works coke pile gantry crane - photo
400-ft gantry crane transported by barge - photo
Gantry crane - video
Mobile gantry crane - video
Moving a 1966 Northfield jointer with a homemade gantry crane - GIF

Launching gantry building an overpass - GIF