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Working principle of ball pen

Can anyone explain me the working principle of ball point pen???

Replies

  • stray fire engg.
    stray fire engg.
    atmospheric pressur yaar
  • Kaustubh Katdare
    Kaustubh Katdare
    stray fire engg.
    atmospheric pressur yaar
    Maybe you should restrict language to English. This is an international forum.

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