Image: Pocket slide rule
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Pocket_slide_rule.jpg (558 × 152 pixels, file size: 63 KB, MIME type: image/jpeg)
Title: Pocket slide rule
Usage Terms: GNU Free Documentation License 1.2
License: GFDL 1.2
License Link: http://www.gnu.org/licenses/old-licenses/fdl-1.2.html
Attribution Required?: Yes
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