1950's GM cars had an ignition switch that allowed you to turn the car off and remove the key in two positions. If you didn't turn it all the way off, the car could be started without a key. I think they used that setup until the early 60's. Everybody knew about it.
I remember walking to work one morning, and seeing a large backhoe in a field with the back up alarm beeping. Walking home the next morning, it was still there beeping, so I checked it out. No key that I could see, so I just bumped the shifter lever out of reverse and left it. A woman came out of a nearby house and thanked me....it had been beeping all weekend.
Rick Potter
DIY journeyman,
FWW wannabe.
AKA Village Idiot.