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William Henry Macgarvey
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Individual
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Individual
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Publication of GB189915090ApublicationCriticalpatent/GB189915090A/en
15,090. MacGarvey, W. H. July 21. Deep-boring.-The bit has a stepped cutting- edge b on one side so as to cut a hole large enough for the lining-tube through which it can be withdrawn.
GB189915090D1899-07-211899-07-21Improvements in or relating to Deep Boring Tools.
ExpiredGB189915090A
(en)