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The 7 pages that link to Ballpoint pen, each with the reason it gives.

• InkRelated: Its viscous ink resists leaking while the ball meters it onto paper.

• Fountain penCompared with: Its ball-based delivery system differs from the fountain pen's liquid ink feed and nib.

• Writing instrumentBroader topic: The ball meters ink while rolling against the writing surface.

• John J. LoudNarrower topic: Loud’s patented device is an early design in this broader class of pens.

• László BíróBroader topic: Bíró’s invention made this pen type practical for everyday writing.

• Marker penCompared with: Its ball mechanism differs from the porous ink-delivery system of a marker.

• George Safford ParkerCompared with: Its rise eventually displaced fountain pens in many everyday writing settings.