When was the first lawn mower invented?

When was the first lawn mower invented?

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1) What furniture item was invented by California furniture designer Charles Prior Hall in 1968?

2) What James Watt invented?

3) Who developed the idea of Crop Rotation?

4) Until Victorian times, chocolate was thought of as a drink. When did the first chocolate bar appear?

5) In which decade was the first solid state integrated circuit demonstrated?