Rock Drill

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A high powered pneumatic or electrically driven device for boring holes into rock.

Keywords

Hammer, tool, percussion, device, drill, hammerdrill, pneumatics

Galleries

Power Tools

Source

Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)

Downloads

TIFF (full resolution)

1885×2400, 1.2 MiB

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804×1024, 199.2 KiB

Medium GIF

502×640, 96.9 KiB

Small GIF

251×320, 29.5 KiB