The first practical incandescent light bulb. Edison and his team of researchers in Edison's laboratory in Menlo Park, N.J., tested more than 3,000 designs for bulbs between 1878<span> and </span>1880<span>. In </span>November 1879<span>, Edison filed a patent for an electric lamp with a carbon filament. hope that this helps you! =)</span>
The US has had the leading economy since it has a controlled economy and it manages its money but the US's economy is going to start going down if they don't stop wasting/spending money.
