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

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

Also in the second half of the '30s [[Columbus]] started producing models with transparent celluloid that allow to see the ink level, according to the new trend inaugurated by [[Vacumatic]]. From this this period was the birth of the [[Columbus 112]], a [[plunger filler]] model. In [[1938]] the company obtained a patent ({{Cite patent|IT|288327}}) for a screw piston, which had as a consequence the creation of the [[Columbus 10x|100]] line, equipped with a [[piston filler]] loading system.  

Also in the second half of the '30s [[Columbus]] started producing models with transparent celluloid that allow to see the ink level, according to the new trend inaugurated by [[Vacumatic]]. From this this period was the birth of the [[Columbus 112]], a [[plunger filler]] model. In 1938 the company obtained a patent ({{Cite patent|IT|288327}}) for a screw piston, which had as a consequence the creation of the [[Columbus 10x|100]] line, equipped with a [[piston filler]] loading system.

During the period between the late '30s and the beginning of the '40s, the company affected, as all other European producers, the effects of the war, and because of economic difficulties and 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 affected, as all other European producers, the effects of the war, and because of economic difficulties and 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.