US Patent: 420,401
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| Ruler
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Patentee:
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| Abraham L. Baer (exact or similar names) - Milwaukee, WI |
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Patent Dates:
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| Applied: |
May 07, 1889 |
| Granted: |
Jan. 28, 1890 |
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Russ Allen.
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Description: |
| Ruler with brackets that project on one side to allow one or more wires to be stretched between them Designed for book keepers since it provides a narrow straight edge that allows the user to see the line as it is being made with out the ruler obscuring the paper. |
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