Modifiche

[[File:Columbus-25-MarbledBrown-Capped.jpg|thumb|left|A [[Columbus 25]]]]

[[File:Columbus-25-MarbledBrown-Capped.jpg|thumb|left|A [[Columbus 25]]]]

Also in the second half of the '30s, according to the new trend inaugurated by [[Vacumatic]], [[Columbus]] started producing models with transparent celluloid that allowed to see the ink level. In this same period there was the birth of the [[Columbus 112]], a [[plunger filler]] model. In [[1938]] the company obtained a patent for a screw [[piston filler]],<ref>Letizia Jacopini in his book report it as n° 288327, but this number is too similar to the previous one, {{Cite patent|IT|268327}}, date ten years befor, and this make that number dubious; the only one other known patent is {{Cite patent|IT|102094}}, found on [[hooded nib]] models produced after WWII and marked [[Columbus Extra 148]] and [[Columbus Extra 150]].</ref> which had as a consequence the creation of the [[Columbus 10x|100]] line, equipped with a [[piston filler]].  

Also in the second half of the '30s, according to the new trend inaugurated by [[Vacumatic]], [[Columbus]] started producing models with transparent celluloid that allowed to see the ink level. In this same period there was the birth of the [[Columbus 112]], a [[plunger filler]] model. In [[1938]] the company obtained a patent for a screw [[piston filler]],<ref>Letizia Jacopini in his book report it as n° 288327, but this number is too similar to the previous one, {{Cite patent|IT|268327}}, date ten years befor, and this make that number dubious; the only one other known patent is {{Cite patent|IT|102094}}, found on [[hooded nib]] models produced after WWII and marked [[Columbus Extra 148]] and [[Columbus Extra 150]].</ref> which had as a consequence the creation of the [[Columbus 10x|100]] line, equipped with a [[piston filler]].

During the period between the late '30s and the beginning of the '40s, the company was affected, as for all other European producers, by the effects of the war, and because of the economic difficulties and the supply shortage a drastic simplification of production was made, using only [[button filler]] and arrow clip on all models. In [[1941]] the company launched a model produced exclusively for the army, the [[Columbus 29]] that after was also distributed on the overall market.

During the period between the late '30s and the beginning of the '40s, the company was affected, as for all other European producers, by the effects of the war, and because of the economic difficulties and the supply shortage a drastic simplification of production was made, using only [[button filler]] and arrow clip on all models. In [[1941]] the company launched a model produced exclusively for the army, the [[Columbus 29]] that after was also distributed on the overall market.