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US Patent: 463,259
Machine for Testing the Strengh of Metals
Patentee:
Esteban D. Estrada (exact or similar names) - Pittsburg, Allegheny County, PA

USPTO Classifications:
72/437, 72/440, 72/446, 73/12.13

Tool Categories:
specialty machines : testing machines

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Apr. 14, 1891
Granted: Nov. 17, 1891

Patent Pictures:
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