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And a "viga lanzadora"is a beam used for launching bits of bridges:
A launching gantry (described also by other terms including beam launcher, girder launcher, bridge building crane, and bridge-building machine, locally nicknamed the Iron Monster) is a special-purpose mobile gantry crane used in bridge construction. It is used to install precast box girders in highway and high-speed rail bridge construction projects. http://en.wikipedia.org/wiki/Launching_gantry
philgoddard United States Native speaker of: English PRO pts in category: 63
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