In which country was Slavoljub Penkala born?, When Slavoljub Penkala comes to Croatia?, Name at least five of Penkala's inventions!, Which is Penkala's first sufferer?, What are the features of his toothbrush?, Today we use the term "pen" for which type of ballpoint pen?, What metal are fountain pens made of?, In what way did he improve the gramophone records of the time?, Name some powders (detergents) that he invented!, Why is Penkala important for the development of Croatian aviation?.

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