Title: European Central Bank.
Question: When was Basel II adopted?

Title: Anti-aircraft warfare.
Question: What decade were the 90 and 120 millimeter guns used until?

Title: East Prussia.
Question: In what year was the Regierungsbezirk Zichenau annexed?

Title: Philosophy of space and time.
Question:
According to Leibniz, what has no existence apart from the existence of objections?