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David Conacher
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Individual
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Individual
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Publication of GB190826668ApublicationCriticalpatent/GB190826668A/en
26,668. Conacher, D. Dec. 9. Drills. - Wings C, D are formed integrally with a twist drill A for countersinking, and have their cutting- edges prolonged into the groove of the drill to ensure their entrance into the drilled hole before the commencement of the countersinking operation.
GB190826668D1908-12-091908-12-09Improvements in and connected with a Combined Boring and Countersinking Drill for Metal Work.
ExpiredGB190826668A
(en)