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bolthole

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bolthole [′bōlt‚hōl]
(mining engineering)
A short, narrow opening made to connect the main working with the airhead or ventilating drift of a coal mine. Also known as bolt.


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Taking trepan specimans from bolthole locations on the rotor hub is also routine.
Like its predecessors, this latest hotel is conceived as an elegant, hospitable haven offering travellers and jaded urbanites scope to experience the intensity of nature, but it is far removed from the anodyne torpor of the typical luxury bolthole.
Karl Popper certainly had his eye on Germany, for he called the denunciation of the closed society written in his New Zealand bolthole "my war effort.
 
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