Wireless was invented by our bassist, who fell off the stage during a concert in the early 70's. Okay, so it didn't make any sound at the time (he did, though), but the concept was there.
BTW, speaking of pickups. I once saw a really cool Fender strat in a shop, where the middle pickup had been mounted on two steel bars and a lever could be used to move it freely between the two outer pickups, which were adjusted down a bit so the movable mid-pickup controlled the sound better.
The cool thing was that this could be done while playing, so one could shift the sound seamlessly for example in the middle of a chord or a long note. It was a professional job done to it and it was way too expensive for me to buy at the time, but I have been thinking of doing something similar myself, some day..