“ Edison welcomed failure . He embraced it. He was rarely able to predict everything that would go wrong with a design he had sketched until that design had been prototyped by his machinists and shop men and had, in some way or other, come up short. As he made the rounds of his shop ﬂoor, his men would tell him what had gone wrong, and Edison would immediately set about searching for solutions. The inventor extended his embrace of problems to products that had already been marketed and sold. He always carefully analyzed customer complaints and used them as the basis for incremental improvements . These innovations on the original inventions were often in themselves patentable , and thus Thomas Edison racked up his world-record number of U.S. patents .” Alan Axelrod
“ Edison was not the only electric light experimenter to realize that the glowing ﬁlament of the electric lamp had to burn in a vacuum to avoid the rapidly destructive effects of oxidation. He emulated others in using a pump to evacuate the bulb, but he decided that the better the vacuum the longer the ﬁlament would burn.
Unlike most of his competitors, he had a laboratory workshop so well equipped and so well staffed that he could afford to take the time to develop superb vacuum pump technology that far surpassed the prevailing state of the art. This represented no original principle or profound advance on existing principles, but it did give him the winning edge for developing a commercially viable electric light.” Alan Axelrod