I want to know the answer to the following question:
How did Edison achieve a higher vacuum than other inventors?
All the background I'm provided with is that "They conclude that Edison's version was able to outstrip the others because of a combination of three factors: an effective incandescent material, a higher vacuum than others were able to achieve (by use of the Sprengel pump) and a high resistance that made power distribution from a centralized source economically viable.". Is that enough to answer the question?
Answer: yes