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US Patent: 779,516
Process of Cuttting Self Hardening Steel
Patentee: John Armstrong (exact or similar names) - Chicago, IL USPTO Classifications: 29/557, 83/14, 83/469 Tool Categories: Assignees: Armstrong Bros. Tool Co. - Chicago, IL Manufacturer: Not known to have been produced Witnesses: Paul Armstrong Louis K. Gillson Charles B. Gillson E. M. Klatcher	Patent Dates: Applied: Mar. 21, 1904 Granted: Jan. 10, 1905 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens Armstrong Brothers Tool Co. history "Vintage Machinery" entry for Armstrong Brothers Tool Co.
Description: Louis K. Gillson - patent attorney

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