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US Patent: 147,402
Improvement in rock-drills
Patentee: Simon Ingersoll (exact or similar names) - New York, NY USPTO Classifications: 173/144, 173/37, 173/39, 248/75 Tool Categories: specialty machines : mining apparatus Assignees: None Manufacturer: Ingersoll Rock Drill Co. - New York, NY Witnesses: Henry C. Sergeant A. H. Elliott	Patent Dates: Applied: Sep. 16, 1873 Granted: Feb. 10, 1874 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Ingersoll-Rand Co.
Description: Improvement to patent 112,254 to add forward feed.

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