File:19th century knowledge mechanisms concrete block mold.jpg

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Description	English: 19th century knowledge mechanisms concrete block mold
Date	1922
Source	Popular mechanics magazine: written so you can ..., Volume 37, Issues 1-6
Author	A. J. R. Curtis

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
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current	03:44, 8 December 2009		571 × 354 (51 KB)	Jonp154 (talk \| contribs)	{{Information \|Description={{en\|1=19th century knowledge mechanisms concrete block mold}} \|Source=Popular mechanics magazine: written so you can ..., Volume 37, Issues 1-6 \|Author=A. J. R. Curtis \|Date=1922 \|Permission= \|other_versions= }}

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