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>
<span>One factor determining the number of
representatives for a given congressional district is the distribution
of D. population within the state.</span>
