Assertion: fountain pen | /r/CapableOf | use cartridge
Facets:
Source sentences:
text: If your fountain pen uses a cartridge or converter, remove it from the nib section.
text: If your fountain pen uses a cartridge, it should unscrew at a point somewhere above the section you hold while writing (grip).
text: Fountain pens that use cartridges or converters are some of the easiest to clean.