'Screw Bolt' mining rock bolt

Gray, Peter, BHP Engineering Pty Ltd

You are viewing the version of work from June 19, 2012, 12:49 p.m. (moderator approved).
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Courtesy of
Powerhouse Museum

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Date modified June 19, 2012, 12:49 p.m. June 19, 2012, 11:45 a.m.