Eduard Slavoljub Penkala is the famous inventor. Born in Slovakia, but his most important inventions he made ​​in Zagreb. His oeuvre includes more than 70 inventions in the fields of mechanics, chemistry, physics, and aviation. The most famous invention was certainly the first mechanical pencil, pen. Of the other fountain pen worth mentioning, baking machine, rotary toothbrush, water bottle, an insecticide, and invented the first two-seater aircraft, which also represents the culmination of his work.