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Patents for John E. Hall
Patents 1 - 15 of 24
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NumberDatePatenteeTitleType
68,588Sep. 03, 1867S. DarlingInkstanddraftsman
73,082Jan. 07, 1868S. DarlingStraight Edgegraduated rules
73,956Feb. 04, 1868S. DarlingImproved Pen Cleanerdraftsman
73,957Feb. 04, 1868S. DarlingImproved Gas Heaterblacksmith
RE2,869Feb. 18, 1868S. DarlingImprovement in the Manufacture of Metallic Squarestry squares
76,409Apr. 07, 1868S. DarlingImprovement in inkstandsdraftsman
76,719Apr. 14, 1868J.E. Hall, S. DarlingImprovment in Inkstandsdraftsman
156,840Nov. 17, 1874S. DarlingInkstandsdraftsman
RE6,443May 25, 1875S. DarlingImprovment in Inkstandsdraftsman
164,721Jun. 22, 1875S. Darlinginkstanddraftsman
RE6,574Aug. 03, 1875S. DarlingImprovment in Inkstandsdraftsman
226,162Apr. 06, 1880S. DarlingCompensating Errors in Screw Dividing Engines
227,962May 25, 1880S. DarlingDividing Engine
230,619Aug. 03, 1880S. DarlingGraduated Measuring Rulerules
233,488Oct. 19, 1880S. DarlingArt of Manufacturing Mathematical Instruments
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