A portable, moving mount for a jackhammer
A handheld, automatically rotated percussive rock drill usually powered by compressed air
A geological period 208-146 million years ago. Dinosaurs and early birds inhabited this period
The use of a high-temperature flame to fuse a rock target, and a stream of water to induce decrepitation and fragmentation, and to flush the fragment out of the target. This technique is progressively used to drill a desired length.