samarjeetsaigal
Member • Aug 1, 2010
Working principle of ball pen
Can anyone explain me the working principle of ball point pen???
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Member • Aug 7, 2010
atmospheric pressur yaarAre you sure? This action cannot be undone. -
Administrator • Aug 7, 2010
Maybe you should restrict language to English. This is an international forum.stray fire engg.atmospheric pressur yaarAre you sure? This action cannot be undone.