Modifiche

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, 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]] loading system.