Sliding cap with frictional engagement
Structure of a ballpoint pen with extensible closing top
Stylized writing instrument
Stylized writing instrument
Telescopic ball-point pen
Telescopic writing instrument
Vented plug for ink cartridges
Writing aid
Writing implement which lengthens and shortens when actuated
Writing implement with a displaceable refill
Writing implement with movable sleeve
Writing instrument
Writing instrument
Writing instrument
Writing instrument
Writing means