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US Patent: 867,556
Combination Tool
Patentee: Robert Campbell (exact or similar names) - Elizabeth, NY USPTO Classifications: 33/371, 33/451, 33/833 Tool Categories: layout tools : squares : try squares rules : rule attachments Assignees: None Manufacturer: Three Tool Rule Co. - Newark, NJ Witnesses: Fredk. C. Fraentzel F. H. W. Fraentzel	Patent Dates: Applied: Oct. 02, 1906 Granted: Oct. 01, 1907 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Attachment for a folding rule that allows it to be used as a marking gage, depth gage, T-square, try-square, etc. Known examples have the patent date marked on the lever and are made of brass or bronze.

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