Interestingly, I Google mapped the address listed in that Edgeworth ad. It looks like the original factory is still there, albeit turned into condos. The Edgeworth name is still printed on the chimney though!
Here's a link https://www.bing.com/maps?osid=7c4e053c-48a1-4700-ab00-5a0cf34e1b3e&cp=37.530481~-77.425173&lvl=21&style=g&imgid=f9247d6b-fb2f-465c-991a-a6bbf830e2c2&v=2&sV=2&form=S00027