Assertion: fountain pen's cap | /r/CapableOf | cover the tip
Facets:
Source sentences:
text: Initially, ballpoint pens had caps to cover the tip, and many manufacturers still sell this design.
text: The simplest types of ballpoint pens are disposable and have a cap to cover the tip when the pen is not in use, or a mechanism for retracting the tip, which varies between manufacturers but is usually a spring- or screw-mechanism.