US Patent: 285,391 - Mortar for stamp-mills


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US Patent: 285,391

Mortar for stamp-mills

Patentee:

John C. Butterfield (exact or similar names) - Chicago, IL

USPTO Classifications:

209/405, 241/270, 241/291, 241/69

Tool Categories:

specialty machines : ore processing apparatus

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

J. C. Turner

R. D. O. Smith

Patent Dates:
Applied:	May 17, 1881
Granted:	Sep. 25, 1883

Patent Pictures:

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Description:

"In the drawings the stamp is shown in connection with and operated by the atmospheric machine for which Letters Patent Nos. 176,400 and 230,611 have been granted to me..."