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In fact, the ancestry of [[Sheaffer]] is seriously under discussion; in fact, there are previous versions of this loading system, a Swedish Johansson patent from 1898 and an American Barnes patent ({{Cite patent|US|726495}}) from 1903, the presence of which has allowed other companies, such as [[Waterman]], to use variants of the same system. However, the success of the system and its enormous diffusion can be attributed to the massive investments of [[Sheaffer]].

In fact, the ancestry of [[Sheaffer]] is seriously under discussion; in fact, there are previous versions of this loading system, a Swedish Johansson patent from [[1898]] and an American Barnes patent ({{Cite patent|US|726495}}) from [[1903]], the presence of which has allowed other companies, such as [[Waterman]], to use variants of the same system. However, the success of the system and its enormous diffusion can be attributed to the massive investments of [[Sheaffer]].