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Creata pagina con "thumb|A Columbus 65 ''knob'' We should speak more specifically of a ''knob'' in all those cases in which the case back of a pen is not..."
[[File:Columbus-65-Black-Knob.jpg|thumb|A Columbus 65 ''knob'']]
We should speak more specifically of a ''knob'' in all those cases in which the [[case back]] of a pen is not simply the end of the barrel, and is not used as a decorative element or as a [[blind cap]] for protection of the [[filling system]], but is instead a direct component of the latter, with the role of part of the device on which one must act to activate it.
We should speak more specifically of a ''knob'' in all those cases in which the [[case back]] of a pen is not simply the end of the barrel, and is not used as a decorative element or as a [[blind cap]] for protection of the [[filling system]], but is instead a direct component of the latter, with the role of part of the device on which one must act to activate it.