Hi. 
Could you please provide a history of dates of the introduction to the
market and product development of devices which protect children from
placing their fingers into electrical outlets. Such as the one below:
http://baby-safety-products.babycatalog.com/baby-safety-electrical/electrical-outlet-caps-93600
Thank you very much.

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Clarification of Question by apolloourson-ga on 12 Sep 2005 11:00 PDT

Price Raised

As one who can distinctly remember what happened when I carefully
managed to get both ends of hair pin in the slits of an electric
socket ...

In Germany at least 29 years ago there were devices to protect against
this, probably for some time before that, since they were familiar to
me then.

Here is a picture of a handful of them:

http://www.auktionsprofi.at/artikel/1120238717715309/kindersicherung.html

They have a sticky surface to hold them on in the socket, which here
is about an inch indented in the surface of the wall with grounding
contacts on the side of this indentattion that hold the plug.  To
insert the plug, one must catch the two little holes with the prongs
and then turn them with the plug to aline them with the holes in the
socket before one can press the plug completely into the socket.

HOpe this is of some help.