US Patent: 3,878,445
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| A.C. Motor Control Apparatus and Method (CNC Control Circuitry)
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Patentees:
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| Edward E. Kirkham (exact or similar names) - Brookfield, Waukesha County, WI |
| Frank Zankl (exact or similar names) - Milwaukee, Milwaukee County, WI |
| Richard Stobbe (exact or similar names) - Greenfield, Milwaukee County, WI |
| John J. Schachte (exact or similar names) - Wauwatosa, Milwaukee County, WI |
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Patent Dates:
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| Applied: |
Sep. 01, 1972 |
| Granted: |
Apr. 15, 1975 |
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Joel Havens
"Vintage Machinery" entry for Kearney Trecker Corp.
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