THE ORIGINAL ONE OF THESE WAS MADE IN THE 1700'S IN INDIA WHERE IT WAS USED BY A VENTRILOQUIST IN AN ACT CALLED THE TALKING KATAR.
I THOUGHT IT WAS TIME FOR A NEW LEGEND ABOUT THESE.
THE ONLY THING I SEE ONITTED SO FAR IS THE STORY THAT THE HIDDEN BLADE WAS POISONED AND THE OUTER BLADE PROTECTED THE WEARER. THEY ARE INTERESTING AND NOT COMMONLY FOUND.