Sarah Slater - Improvement in compounds for welding, hardening, and tempering steel.

Inventor

Sarah Slater

Nº

165378

Invention

Improvement in compounds for welding, hardening, and tempering steel.

Date

July 5, 1875

Address

Philadelphia, PA

Assignor

assignor to herself, Henry W. Gray, and Moses Smiley, same place.

Assignor Address

Illustration

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