US Patent: 2,835,172
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| Rotary Head Milling Attachment
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Patentees:
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| Orrin W. Barker (exact or similar names) - New Berlin, Waukesha County, WI |
| Ralph E. Saving (exact or similar names) - Wauwatosa, Milwaukee County, WI |
| Lloyd D. Libby (exact or similar names) - Minneapolis, MN |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 13, 1955 |
| Granted: |
May 20, 1958 |
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Joel Havens "Vintage Machinery" entry for Kearney & Trecker Co.
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