US Patent: RE4,019
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| Improvement in Curtain-Knobs
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Patentee:
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| Calvin Z. Kroh (exact or similar names) - Tiffin, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jun. 07, 1870 |
| Reissue Information: |
| Reissue of 49,634 (Aug. 29, 1865) |
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Patent Pictures:
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Calvin Z. Kroh reissue Pat. June 7, 1870 |
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Stan Schulz
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Description: |
| The improvement is a polygonal bearing surface between the knob and screw to allow the use of a "hollow screw-driver" or "bit-wrench" to install or remove the hardware. The "bit-wrench" is shown in the drawing.
This curtain knob is to fasten side-curtains on buggies, etc. |
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