They're not really call mini-receptacles.
I don't know what they are called, but i'm referring to the 3-in-1, "cube tap" receptacles that they used to sell that were very small, only about 2 inches long, which were designed to accept 3 plugs, rectangular plugs only 1/2 to 5/8" thick. If you plugged a big round plug in, even to the slot on the end, it would probably cover all 3 receptacles. I can't find an image of it, but nowadays the space allotted for plugs keeps growing and growing. This was the opposite. Do you know what I mean?
Do they still sell them, and if not, why not? Some "safety" reason?
Similarly the plugs that would fit them. Only 1/2 to 5/8' thick, but much wider of course. . I don't know if anything came with such a plug attached, but they were sold separately, and were needed if one had an outlet or receptacle and one wanted to fit 3 plugs in it.
Now, cords often come with rather small plugs on them, but at the end, the flat end with the prongs coming out, there is a baseboard or a flared skirt, that makes the plug 1/8" bigger all around. So that you often can't get two plugs in adjoining slots. What is the purpose of that extra width?
The plug on the left of this picture has a skirt like I mean:
One could plug these things in more places if the edge were not there, of if one cut it off. Why is the edge there? Do they no longer think a 3-receptacle extension cord can really hold 3 plugs so close together?