File:Cassier's Magazine - The material lock used in sinking cylinders with compressed air.jpg

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English: The material lock used in sinking cylinders with compressed air.
Date
Source https://en.wikisource.org/wiki/Page:Cassier%27s_Magazine_Volume_XV.djvu/21
Author Photo by Sir William Arrol & Co. Ltd.

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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.

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Cassier%27s_Magazine_-_The_material_lock_used_in_sinking_cylinders_with_compressed_air.jpg

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THE MATERIAL LOCK USED IN SINKING CYLINDERS WITH COMPRESSED AIR.

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