MANY FANS HAVE A HANDLE AND A PERMANENTLY OPEN BLADE. MOST FANS THAT FOLD UP ONLY OPEN 90 DEGREES OR HALF WAY. SOME FANS HAVE LONGER SIDES AND OPEN COMPLETELY AND THE SIDES BECOME THE HANDLE LIKE THE BUTTERFLY KNIVES. WHICH CAME FIRST PROBABLY THE FAN AND THAT GAVE SOMEONE THE IDEA FOR THE KNIFE. I HAVE SEEN JAPANESE DAGGERS DISGUISED AS FANS BUT THEY WERE THE USUAL KNIFE AND SCABBARD FORM. THE KNIFE THAT STARTED THE POST MAY HAVE BEEN PURPOSELY DISGUISED AS A RULER.
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