US Patent: 1,000,221
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| Drafting Instrument
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Patentee:
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| Herman Wilms (exact or similar names) - East Pittsburgh, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 16, 1911 |
| Granted: |
Aug. 08, 1911 |
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Ralph Brendler
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Description: |
| This design attaches a standard ruler to a T-Square with a sliding collar, allowing it to be easily slid side to side for taking measurements. The collar also automatically adjusts to various widths and thicknesses of squares. |
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