Quoting from the sign, "this piece of equipment was the first successful mining device to replace human labor in removing the rubble from from underground hard-rock blasting. The Model 12B, which weighs 4,200 pounds and requires 60 to 125 pounds-per-square-inch air pressure, was first introduced in 1938." Like many such things in Arizona (and elsewhere) this equipment is rusting along side the road.
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