> The incandescent light bulb? At one time considered to be a securities fraud! The British parliament assembled a team of investigators to probe Edison's claim

> The incandescent light bulb? At one time considered to be a securities fraud! The British parliament assembled a team of investigators to probe Edison's claims. I don't know this story, but maybe they were investigating patent infringement? Edison's work drew heavily on the much earlier work of British (and other) inventors and was patented after Joseph Swan's similar patent. Joseph Swan had demonstrated his practical bulb about 10 months before Edison applied for his patent, and was lighting private homes (e.g. Cragside) and theatres at about the same time Edison got going.