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Patents for John E. Hall
Patents 16 - 24 of 24
First set of recordsPrevious set of recordsLast set of records
NumberDatePatenteeTitleType
235,133Dec. 07, 1880S. DarlingMicrometer Gage for Wire & Sheet Metalmicrometers
241,879May 24, 1881E.L. ParsonsGear Wheel Cuttermilling machine cutters
252,436Jan. 17, 1882S. DarlingMetallic Try Squaretry squares
287,420Oct. 30, 1883S. DarlingMicrometermicrometers
289,512Dec. 04, 1883S. DarlingGraduated Measure of Lengthrule graduations
289,513Dec. 04, 1883S. DarlingMicrometer Gagemicrometers
292,415Jan. 22, 1884S. DarlingComparator
370,379Sep. 27, 1887S. DarlingPen Cleanerdraftsman
376,430Jan. 17, 1888S. DarlingProtractorprotractors
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