US Patent: 63,060
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Book Keeper's Ruler
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Patentee:
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A. O. Latham (exact or similar names) - Wheeling, WV |
Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Granted: |
Mar. 19, 1867 |
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Russ Allen.
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Description: |
Ruler with a second ruler swivelling on a pin that allows angled lines to be drawn without moving the main ruler and due to not having to move the primary ruler prevents smudging lines. |
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