The primary objective of {TAIL ~ the present invention} is to provide {HEAD ~ a new and improved drill} of the same general type as that disclosed in Shallenberger, U.S. Pat No 5,092,718, but having a length which is substantially greater than its diameter to enable the drill to produce relatively deep bores as compared to their diameters 
The primary objective of { TAIL ~ the present invention } is to provide { HEAD ~ a new and improved drill } of the same general type as that disclosed in Shallenberger , U.S. Pat No 5,092,718 , but having a length which is substantially greater than its diameter to enable the drill to produce relatively deep bores as compared to their diameters
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