ded, and attached to the reciprocating chisel is replaced by an endless chain consist- scriptions of drilling apparatus. In making oblong dead lower end of the drilling spindle. The chuck is constructed square cornered holes, either the substance to be operated in such manner as to admit of the… … Fsc:; 4 less than three electric light companics have been registered within the last few days, with a total capital of over 2. %4 O £200,000. The British Electric Light Company, promoted by Mr. E. J. Reed, takes up Rapieff’s patent, and is patron- TOOL FOR DRILLING SQUARE HOLES, ized by the Times.…
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten10unit-181-138.webp)
