[Answer] 3. It got very dirty in his basement, so Harry decided to invent something to clean it. But, his idea had already been created by the American Daniel Hess. What was his invention?

Step 1 : Introduction to the question "3. It got very dirty in his basement, so Harry decided to invent something to clean it. But, his idea had already been created by the American Daniel Hess. What was his invention?"

...1. Vacuum cleaner 2. Mop 3. Duster 4. Broom Daniel Hess' invention was first called the "Carpet Sweeper", not the vacuum cleaner. His patent was number 29,077 in the USA and was issued on 10th July 1860.

Step 2 : Answer to the question "3. It got very dirty in his basement, so Harry decided to invent something to clean it. But, his idea had already been created by the American Daniel Hess. What was his invention?"

Vacuum cleaner:

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