I have been trying to find info on what company makes which disposal.I am talking about old ones.I just ordered a National disposer its New in box but Old and have No Idea who made them.I know Bus-boy used to make them for the homes and Maytag and Kitchenaid made there own but now there are only Three of manufacters now.Ise,Wasteking,and White-Rock they make Sinkguard.I collect these things and finding info on them is HARD.I have about 9 of them my Goal is to find a Old Maytag but I have only seen one of them on ebay and I got out bid next time THAT will not happen.I rember the Nail grinding commercials when I was young now eveything is Ise Junk well the New Evolution Excel is O.k. It is Very quite and does grind better but its no Old School Job has that cheap stamped Grind ring like all of them.The Waste-Kings are SO Noisy and the Clicking impellers drive me NUTS I am talking about the ones today not the good ones from the 80s.