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Therefore, the bottoms of classic [[piston filler]]s are classifiable as such (not those used to protect a knob underneath), the knobs of [[plunger filler]] system, those of [[safetiea]] and also those of some specific types of [[button filler]]s (like the [[push-knob]]). In all of these cases the ''knob'' is a constituent part of the pen's filling mechanism, and is used for handling. A photo gallery can be found on [[Knob_Gallery|this page]].
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