US Patent: 858,913
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| Drafting Instrument
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Patentee:
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| Robert G. Sauer (exact or similar names) - Louisville, KY |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 30, 1907 |
| Granted: |
Jul. 02, 1907 |
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Ralph Brendler
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Description: |
| This is a typical draftsmans T-square, with an extra pair of arms attached at right angles to each other, and to a protractor on the T-square. The claims say this is particularly handy for perspective drawings. |
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