rathole

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rathole [′rat‚hōl]

(mining engineering)

A shallow, small-diameter, auxiliary hole alongside the main borehole, drilled at an angle to the main hole; after core drilling is completed, the rathole is reamed out and the larger-size hole is advanced, usually by some noncoring method.

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No references found			We are ready for anything; and he, without waiting for a reply, applies his mouth to one of the ratholes. Tom Brown's Schooldays by Hughes, Thomas View in context			rated flow rated horsepower rated lamp life rated load rated relieving capacity rated speed Ratel Rates of Expenditure of Material Resources, Formulation of Rates, Comprehensive ratfish RATFIV RATFOR rath Rath Yatra Rathbone, Basil Rathbone, Monroe J. Rathenau Rathenau, Walther Rathenow Rather, Dan rathite Rathje, William L. Rathke's pouch Rathke, Martin H Rathlin Island rathole Ratibor Ratification Ratification Day rating rating correction factor rating curve rating nut Ratio ratio arm circuit ratio control system ratio delay study ratio detector ratio deviation ratio estimator ratio map ratio meter ratio of expansion ratio of reduction ratio of rise ratio of similitude ratio of specific heats ratio of transformation ratio of transformer ratio paper ratio print			Rathke cleft Rathke cleft Rathke cleft Rathke cleft Rathke pouch Rathke pouch Rathke Pouch Homeobox Rathke's bundles Rathke's c Rathke's c Rathke's c Rathke's cleft Rathke's cleft Rathke's cleft c Rathke's cleft c Rathke's cleft c Rathke's cyst Rathke's cyst Rathke's cysts Rathke's cysts Rathke's cysts Rathke's pouch Rathke's pouch Rathke's pouch Rathke's pouch pouch cyst Rathke's pouch pouch cyst Rathke's pouch tumor Rathke, Martin H Rathlin Rathlin Island rathole ratholed ratholed ratholes ratholes Ratholing Ratholing rathouse Rathripe raths raths Rathskellar (disambiguation) rathskeller rathskellers Rathyatra Rathymotheriidae Rati Rati Rati Ratibida Ratibida columnaris Ratibida columnifera Ratibida tagetes Ratibor raticide ratifiable ratifiable ratification ratification ratification ratification

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rathole