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<noinclude>{{ReferBox|Filling systems}}</noinclude>In 1924 ''Seth Chilton Crocker'' resumed the idea of the ''blow filler'' invented by his father ''Seth Sears Crocker'', further refining it using a new patent ({{Cite patent|US|1528379}}, by David J. La France). The new system was based on the fact that the body of the pen slides around a metal tube screwed on the nib assembly to which was mounted the classic rubber sac to compress. To perform this action, the outer barrel of the pen could slide on the inner barrel and the watertight seal between the two was made by a waxed wire placed at the end of the inner metal cylinder.

<noinclude>{{ReferBox|Filling systems}}</noinclude>In [[1924]] ''Seth Chilton Crocker'' resumed the idea of the ''blow filler'' invented by his father ''Seth Sears Crocker'', further refining it using a new patent ({{Cite patent|US|1528379}}, by David J. La France). The new system was based on the fact that the body of the pen slides around a metal tube screwed on the nib assembly to which was mounted the classic rubber sac to compress. To perform this action, the outer barrel of the pen could slide on the inner barrel and the watertight seal between the two was made by a waxed wire placed at the end of the inner metal cylinder.