| http://www.w3.org/ns/prov#value | - A preferred embodiment of roller ball pen includes a pen body with distal and proximal ends, a roller ball cartridge inserted into the pen body (with the writing end extending at least partially out of the distal end of the pen body), a cap detachably attached to the proximal end of the pen body, a drive rod rotatably fixed to the cap, a control member such as a nut, and a binsing element (prefera
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