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In those years however production continued without significant changes, the company had in fact a functional and efficient fountain pen, and saw no reason to make changes. However [[mottled|marbled hard rubber]] was introduced (1913?). In a [[1913]] catalog are  cited the  ''Hermit'' (a [[safety]]) and ''Pentago'' models, where the [[Valvless]] model is in [[1915]]. The ''[[overfeed]]'' nib  was replaced by an ordinary nib in [[1921]], when it was also introduced the [[InkPencil]], a [[plunger filler]] stylographic model.
 
In those years however production continued without significant changes, the company had in fact a functional and efficient fountain pen, and saw no reason to make changes. However [[mottled|marbled hard rubber]] was introduced (1913?). In a [[1913]] catalog are  cited the  ''Hermit'' (a [[safety]]) and ''Pentago'' models, where the [[Valvless]] model is in [[1915]]. The ''[[overfeed]]'' nib  was replaced by an ordinary nib in [[1921]], when it was also introduced the [[InkPencil]], a [[plunger filler]] stylographic model.
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In the '20s there were several innovations, hounded by competition [[Onoto]] began to produce [[lever filler]] models, the [[Onoto 7000|7000]] and [[Onoto 8000|8000]]. The introduction date of these models is uncertain and various sources report either the [[1922]], [[1923]] or [[1924]].<ref>respectively [http://www.penmuseum.co.uk/master%2011.htm], [http://www.onoto.com/ingenuity.asp] and [http://hubpages.com/hub/A-Brief-History-of-Onoto-Pen]; Andreas Lambrou speaks of a 1924 patent.</ref> In [[1924]] was also produced the [[Mammoth 1800]] model, a pen with a large number 8 nib, and the following year the [[Princess Mary]] a model made in blue colored hard rubber. It was also started a production of pens simply called ''De La Rue'', from which is known the [[Swift]] model. The company continued to resist the trends and innovations, as well as the introduction of celluloid is quite late; even in this case are given different dates,<ref>respectively [http://www.penmuseum.co.uk/master%2011.htm] gives the 1926 and [http://www.onoto.com/ingenuity.asp], [http://hubpages.com/hub/A-Brief-History-of-Onoto-Pen] and Andreas Lambrou the 1928.</ref> the [[1926]] or [[1928]].  
In the '20s there were several innovations, hounded by competition [[Onoto]] began to produce [[lever filler]] models, the [[Onoto 7000|7000]] and [[Onoto 8000|8000]]. The introduction date of these models is uncertain and various sources report either the 1922, 1923 or 1924.<ref>respectively [http://www.penmuseum.co.uk/master%2011.htm], [http://www.onoto.com/ingenuity.asp] and [http://hubpages.com/hub/A-Brief-History-of-Onoto-Pen]; Andreas Lambrou speaks of a 1924 patent.</ref> In 1924 was also produced the [[Mammoth 1800]] model, a pen with a large number 8 nib, and the following year the [[Princess Mary]] a model made in blue colored hard rubber. The company continued to resist the trends and innovations, as well as the introduction of celluloid is quite late; even in this case are given different dates,<ref>respectively [http://www.penmuseum.co.uk/master%2011.htm] gives the 1926 and [http://www.onoto.com/ingenuity.asp], [http://hubpages.com/hub/A-Brief-History-of-Onoto-Pen] and Andreas Lambrou the 1928.</ref> the 1926 or 1928.
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