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The system was mainly used by [[A. A. Waterman]] who around 1902 acquired a patent ({{Cite patent|US|744642}}, attributed to ''Harry W. Stone'') relating to it. Other companies introduced similar systems, or inspired by the same principle of rotating the bottom of the pen to squeeze the tank, such as the [[leverless]] of the [[Swan]]. A very particular version of this type of loading was used on a prototype pen of the [[Nettuno]] never marketed.<noinclude>

The system was mainly used by [[A. A. Waterman]] who around [[1902]] acquired a patent ({{Cite patent|US|744642}}, attributed to ''Harry W. Stone'') relating to it. Other companies introduced similar systems, or inspired by the same principle of rotating the bottom of the pen to squeeze the tank, such as the [[leverless]] of the [[Swan]]. A very particular version of this type of loading was used on a prototype pen of the [[Nettuno]] never marketed.<noinclude>

==Related Patents==

==Related Patents==

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{{ListsPatentsFeature|Twist filler}}

[[Category:Translated Pages]]

[[Category:Translated Pages]]

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