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[[Image:ColumbusSpoonFiller.jpg|thumb|Patent excerpt for the new filling system]]
[[Image:ColumbusSpoonFiller.jpg|thumb|Patent excerpt for the new filling system]]
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While maintaining the production of previous models the new [[Columbus]] began to put attention to technical innovations, a new double channel feeder, used on top models until the 40s, was created, and the company began testing the use of celluloid. The company tried to position themselves on the market aiming to produce pens which were generally of good quality but sold at the lowest prices possible. In 1929 a new filling system was patented ({{Cite patent|GB|334913}}), essentially an own version of the [[spoon filler]]. This patent also has a very interesting story, there is in fact a variant of 1931, the {{Cite patent|CA|327288}}, that's assigned to the [[Swan|Mabie Todd]] company, that in that period was about to launch its [[leverless]] filler, which creates an unexpected link between these two companies.
While maintaining the production of previous models the new [[Columbus]] began to put attention to technical innovations, a new double channel feeder, used on top models until the 40s, was created, and the company began testing the use of celluloid. The company tried to position themselves on the market aiming to produce pens which were generally of good quality but sold at the lowest prices possible. In 1929 a new filling system was patented ({{Cite patent|GB|334913}}), essentially an own version of the [[spoon filler]]. This patent also has a very interesting story, there is in fact a variant of 1931, the {{Cite patent|CA|327288}}, that's assigned to the [[Swan|Mabie Todd]] company, that in that period was about to launch its [[leverless]] filler, which creates an unexpected link between these two companies.
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[[Image:192x-Columbus-Extra-Flattop-Front.jpg|thumb|left|A ''[[Flat top]]'' style [[Columbus Extra|Extra]] from '20s]]
[[Image:192x-Columbus-Extra-Flattop-Front.jpg|thumb|left|A ''[[Flat top]]'' style [[Columbus Extra|Extra]] from '20s]]