File:Senator John Heinz History Center - IMG 7824.JPG
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Summary[edit]
| Description | Exhibit in the Senator John Heinz History Center, 1212 Smallman Street, Pittsburgh, Pennsylvania, USA. There were no restrictions on photography in the museum collections. Thacher cylindrical slide rule, circa 1890; patented in 1881 by Edwin Thacher (1839-1920). |
| Date | |
| Source | Self-photographed |
| Author | Daderot |
| Permission (Reusing this file) |
Public domain. |
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:56, 12 December 2010 | | 3,264 × 1,304 (1.31 MB) | Daderot (talk | contribs) |
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