The top left seems to correspond to a connector with a pinout I don't recognize.
I'm guessing the top and bottom holes are for screws to secure it to some electronic item.
Just thinking out loud...
You've virtually got it there, but if you factor in this post:
This straightens something.
You should get the purpose and the items it is for might be a little more obvious.
Saying that, I don't know how old you are so you may not remember them.