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For some time the two brands were produced together, the [[Mentmore]] was transformed into a joint stock company in [[1930]]. It is not clear the situation at that time, there are those who reported that the [[Mentmore]] brand has been progressively replaced by [[Platignum]], but by the late '30s to the '50s, there is still a large production of pens with this brand.
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For some time the two brands were produced together, the [[Mentmore]] was transformed into a joint stock company in [[1930]]. It is not clear the situation at that time, there are those who reported that the [[Mentmore]] brand has been progressively replaced by [[Platignum]], but by the late '30s to the '50s, there is still a large production of pens with this brand. Association with [[Mentmore]] is established at least until 1951.<ref>thanks to [[:File:1951-Platignum.jpg|this advertisement]].</ref>