Which invention is linked to Slavoljub Eduard Penkala, who was active in Zagreb in the early twentieth century?
Answer and explanation
Correct answer: D. The mechanical pencil and the fountain pen
- Step 1: Penkala started a factory in Zagreb. Step 2. He patented a mechanical pencil and a fountain pen. Answer: The mechanical pencil and the fountain pen. Why not the others: The others have other inventors.
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