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For some time the two brands were produced together; the [[Mentmore]] was transformed into a joint stock company in [[1930]]. The situation at that time is not clear, there are those who reported that the brand [[Mentmore]] has been progressively replaced by [[Platignum]], but by the late '30s to the' 50s, there is a large production of pens with this brand . Also a patent of 1936  ({{Cite patent|GB|457212}}) explicitly shows the name of ''Spot Pen Company'' as the new name of ''Mentmore Manufacturing Company''.
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For some time the two brands were produced together; the [[Mentmore]] was transformed into a joint stock company in [[1930]]. The situation at that time is not clear, there are those who reported that the brand [[Mentmore]] has been progressively replaced by [[Platignum]], but by the late '30s to the' 50s, there is a large production of pens with this brand . Also a patent of 1936  ({{Cite patent|GB|457212}}) explicitly shows the name of ''Spot Pen Company'' as the new name of ''Mentmore Manufacturing Company''. Association with [[Platignum]] brand is established at least until 1951.<ref>thanks to [[:File:1951-Platignum.jpg|this advertisement]].</ref>

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