Original printed patent application number 2831 for improvements in hand drilling machines 1909 jan 05 2021 posted by paulo coelho media publishing text id 89512997 online pdf ebook epub library any new useful improvement thereof there is provided a drilling method capable of improving machining accuracy of a printed board drilling apparatus as a whole by. A drilling machine for drilling fishplate holes in the end of a rail 10 for a railway or railroad track comprises an electric power drill 20 slidably mounted on a column 14 and supporting on its spindle arbor 58 an annular cutter 26 the column 14 is attached to a base 12 which is firmly clamped to the rail 10 by a clamping mechanism 16a. Improvement in drilling machines download pdf info application number publication date 1873 01 28 1873 01 28 application granted granted critical 1873 01 28 publication of us135313a publication critical patent us135313a en 1890 01 28 anticipated expiration legal status critical status expired . Us135613a us135613da us135613a us 135613 a us135613 a us 135613a us 135613d a us135613d a us 135613da us 135613 a us135613 a us 135613a authority us united states prior art keywords shaft wheel arm drill dog prior art date 1873 02 04 legal status the legal status is an assumption and is not a legal conclusion. John l ssin0r to hamilton zbatea a drilling machine id atnie l l b ate 5 patented aug 81871 invent 0p f w mam u cqqu a l0c 5 n ited states patent office john lemman of oinoinnati assignor to hamil on bates and daniel l bates 0f dayton ohio improvement in drilling machines
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