At the 2005 Nurnberg Toy Fair there was a stand using radio control with a Lenz LH100 handset attatched to a radio device that was fitted underneath the handset.
I had a "play" with it & it worked exactly like the wired one - unforunatly, My German is almost non-existant & no-one on the stand spoke English.
So, radio control (as well as IR) has been with us some time.
Somewhere, I have the leaflets & will try to find them.
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