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US Patent: 49,034
Improvement in rock-drills
Patentee: Charles W. Johnson (exact or similar names) - Waterbury, CT USPTO Classifications: 175/389, 175/413 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: S. M. Cate, Jr. S. W. Kellogg	Patent Dates: Granted: Jul. 25, 1865 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Blake & Johnson Co.
Description: Of interest because of a very tentative connection to grinder maker Blake & Johnson.

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