They peed on it!!!!
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Writing, language, arithmetic, the wheel, fire, cooking, cutting tools, That's a few I think important.
There were many inventions of the 1930's. A few are the electric razor, the television, parking meters and nylon stockings.
There were numerous great inventions in the early 1900's. A few of the inventions were the airplane, adhesive tape, and the ball point pen.
Resistance decade box is nothing but Resistance bank. It has various ranges of Resistance value ranging from few ohms to few mega ohms. In other terms, large value of resistance are fabricated in single box is said to be Resistance decade box.
Willis Carrier invented the Air Conditioner, a few others.