Answers

2016-07-10T16:15:13+08:00
Ballpen is a common noun, if you want a proper noun of a ballpen ,it could be: HBW, Pilot, etc. it's just a name of a ballpen.
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2016-07-10T16:41:57+08:00
Hbw,panda,faber castel,etc.  

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