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US Patent: 639,560
Caliper Attachment
Patentee: Bengt M. W. Hanson (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 33/829 Tool Categories: layout tools : measurement gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: Charles F. Johnetz Henry Bissell George A. Hoffman	Patent Dates: Applied: Jun. 06, 1899 Granted: Dec. 19, 1899 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Hanson-Whitney Machine Co.

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