don't touch my touch screen

touch / don't touch Taken today while visiting a big industrial factory. The left sticker says: "touch screen: no BEWARE: don't touch the screen... except me: I am the operator" and the right one says "Don't touch my screen". It reads like a Kraftwerk song.

I found interesting the existence of these stickers which gives order about ownership of touch-screen. There aren't any sticker about keyboard ownwership but in that factory, it seems that touch screens make me people willing to touch/interacti with the device.