I told myself one day I would document all of my drum keys. Why? I'm not sure exactly, but as I find photos, history and catalog pages showing drum keys I wanted to have a place to keep the history.
So I thought a great starting point was to just photo all of the keys I have.
Then when I find catalog pages I have a location to keep it.
I still have not found a patent for the "Drum Key" like we know it today.
David