English: Cameron Ram-type Blowout Preventer (1922)
U.S. Patent 1,569,247. Text was removed from figure and minor cleanup of the scan was done with Microsoft Paint.
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{{Information |Description={{en|1=Cameron Ram-type Blowout Preventer (1922) U.S. Patent 1,569,247. Text was removed from figure and minor cleanup of the scan was done with Microsoft Paint {{PD patents}}}} |Source=http://patimg1.uspto.gov/.piw?Docid=015692
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