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Slide rule to OPO

  1. physiatrist
    Gingerbread Nov 27, 2014

    physiatrist , Nov 27, 2014 :
    Do you know what a slide rule is? When was the last time you used one? Are you ready to buy an OPO NOW? Invite expires in 2 days.
     

    #1
  2. jambola2
    Cupcake Nov 27, 2014

    jambola2 , Nov 27, 2014 :
    A slide rule is some sort of scale that is not used to measure, but for math ? (ty google)
    I've never used one.
    And yes, I'm ready to buy an OPO NOW !
     

    #2