Category:John R. Clarke

<nowiki>John R. Clarke; জন আর ক্লার্ক; John R Clarke; John R Clarke; John R. Clarke; John R. Clarke; John R. Clarke; John R. Clarke; John R Clarke; John R. Clarke; John R. Clarke; John R. Clarke; John R Clarke; John R. Clarke; John R. Clarke; جون آر. كلارك; John R. Clarke; John R. Clarke; American scientist and underwater breathing apparatus authority; inventor estadounidense; inventor estauxunidense</nowiki>
John R. Clarke 
American scientist and underwater breathing apparatus authority
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Date of birth20 November 1945
Fort Smith
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Media in category "John R. Clarke"

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