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periscope rifle
A periscope rifle is a rifle that has been adapted to enable it to be sighted by the use of a periscope. This enables the shooter to remain concealed below cover. The device was independently invented by a number of individuals in response to the trench warfare conditions of the First World War, and while it is not clear which army was the first to use periscope rifles, the weapons were in use by the end of 1914. Similar devices were also built for use with machine guns.〔Saunders, Anthony (2000). p. 100.〕〔(【引用サイトリンク】title=Periscope Lewis Gun )〕
==Youlten hyposcope==
The first periscope sighting rifle attachment was the Youlten hyposcope invented by W. Youlten. An early version of the attachment was tested in 1903, receiving its first patent in 1914. Its maximum range was .〔(【引用サイトリンク】title=Youlten Hyposcope Article )〕〔(【引用サイトリンク】title=Youlten Hyposcope Photo )〕〔(【引用サイトリンク】title=West Gippsland Gazette )〕
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