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US Patent: 4,120,030
Computer Software Security System
Patentee: Richard Johnstone (exact or similar names) - Brookfield, Waukesha County, WI USPTO Classifications: 711/E12.092, 713/190 Tool Categories: metalworking machines : milling machines : numerically controlled milling machines Assignees: Kearney & Trecker Corp. - West Allis, Milwaukee County, WI Manufacturer: Kearney & Trecker Corp. - West Allis, Milwaukee County, WI Witnesses: Unknown	Patent Dates: Applied: Mar. 11, 1977 Granted: Oct. 10, 1978 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Kearney Trecker Corp.

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