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US Patent: 153,115
Improvement in processes for tempering the blades of squares
Patentee:
Isaiah J. Robinson - 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 ]
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Description:
Two slightly different squares appeared in Martin J. Donnelly auctions. Both had this patent date.

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