Limited Access drills are commonly used for areas where conventional drilling equipment can not access. They are also used in areas with low overhanging canopy's (gas station, etc. ) and also used for indoor drilling applications like warehouses, garages and basements.
[pdf] The construction of Hoover Dam, Boulder City, Nevada. This piece of equipment, named a Jumbo Rig, was designed to speed up the Hoover Dam’s tunnel drilling process. Built on the back of a 10-ton truck, 24 to 30 drills could be operated at once.
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