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boulder buster

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boulder buster [′bōl·dər ‚bəs·tər]
(engineering)
A heavy, pyramidal- or conical-point steel tool which may be attached to the bottom end of a string of drill rods and used to break, by impact, a boulder encountered in a borehole. Also known as boulder cracker.
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BOULDER BUSTER Firemen need it, construction groups need it and in the bad old days of South Africa's border war, it would have been handy to remove obstacles in the field.
The hidden edge South Africa's world class inventions by Versi, Anver; Addison, Graeme / African Business
 
 
 
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