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US Patent: 457,077
Attachment for Graduated Rules
Patentee: Mens A. Dahl (exact or similar names) - West Orange, NJ USPTO Classifications: 33/486 Tool Categories: rules : rule attachments rules : rule accessories Assignees: None Manufacturer: Not known to have been produced Witnesses: Alfred Gartner Albert A. Schmidt	Patent Dates: Applied: Oct. 04, 1890 Granted: Aug. 04, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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