| http://www.w3.org/ns/prov#value | - These and other objects are attained in a device for breaking rock, concrete and reinforced concrete by pulsewise liquid pressure, adapted to be lowered into a hole pre-drilled in the material to be broken and pre-filled with a liquid, the device including a housing with an internal cavity and lateral apertures through which this cavity is adapted to communicate with the hole, the housing having a
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