File:Collier's 1921 Coal - Jeffrey loading conveyor.jpg

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Description
English: JEFFREY LOADING CONVEYOR USED IN A COAL MINE.
Date published 1921
Source “Coal,” Collier's New Encyclopedia, v. 3, 1921, p. 31.
Author Unknown authorUnknown author
Permission
(Reusing this file)
Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Collier%27s_1921_Coal_-_Jeffrey_loading_conveyor.jpg

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Date/TimeThumbnailDimensionsUserComment
current20:36, 2 November 2017Thumbnail for version as of 20:36, 2 November 20171,481 × 858 (570 KB)Bob Burkhardt{{Information |Description ={{en|1=JEFFREY LOADING CONVEYOR USED IN A COAL MINE.}} |Source =“Coal,” ''Collier's New Encyclopedia'', v. 3, 1921, p. 31. |Author =unknown artist |Date =published 1921 |Permission ={{PD-...
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