was actually surprised that I knew 3 manufacturers (guns are illegal here, so I guess I picked up the names from movies, I guess a lot of info is obtained that way, by osmosis)
Personally I think he should have more credit for his contributions to cinema and sound recording, his advances with the lightbulb weren't that big considering Swan had done most of the work but as a modest man let Edison do what he wanted as long as it didn't affect the UK.
He would be one of a few that I could ve named myself (without being asked specefic questions to be reminded first. I guess the list would be tesla, edison, volta, watt, bell, cury (x-ray right?) I know more but those are the first few that drift to the surface)
The first machine gun was the Maxim gun, invented by Sir Hiram Maxim.
I suppose it depends on the definition of machine which varies from person to person. Personally I think the Maxim Gun was the first.