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US Patent: 153,115
Improvement in processes for tempering the blades of squares
Patentee: Isaiah J. Robinson (exact or similar names) - St. Johnsbury, VT USPTO Classifications: 148/644, 148/647, 266/260 Tool Categories: layout tools : squares : carpenter squares Assignees: St. Johnsbury Tool Co. - St. Johnsbury, VT Manufacturer: St. Johnsbury Tool Co. - St. Johnsbury, VT Witnesses: N. M. Johnson T. Fairbanks	Patent Dates: Applied: May 11, 1874 Granted: Jul. 14, 1874 Patent Pictures: [ 1 | 2 | 3 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen
Description: Two slightly different squares appeared in Martin J. Donnelly auctions. Both had this patent date.

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