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Patents for Hartford Special Machinery Co.
Patents 1 - 4 of 4
First set of recordsLast set of records
NumberDatePatenteeTitleType
1,370,598Mar. 08, 1921D.H. LapointeChuckdrill press chucks
2,144,486Jan. 17, 1939E.M. ErbLocating Devicemilling machine accessories
GB-501,631Mar. 02, 1939E.M. ErbImprovements in Indexing Devices for Chucks and Other Work Holders milling machine accessories
2,779,220Jan. 29, 1957O.L. Wright, Jr., R.J. Dunn, Jr.Universal Drilling Machinemultiple spindle drill presses
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