Marked 'MM Made in Japan'?
Can anyone help me identify what these little jars are for, and also what company produced them? My mother-in-law gave them to me to sell in my online store, but I am having a heck of a time finding anything about them! They are marked MM on the bottom and also have an "O" over the plugs that go inside them. I know that Noritake marked many of their items with a single "M" that looks a little like this, but I can find no evidence of any "MM" from them. Any help would be greatly appreciated!
A photo showing the mark: http://twitpic.com/2gk9ed
A photo showing the black O and the tray they sit on: http://twitpic.com/2gkbtk