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May 18, 2010
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CONGRATS TO CLAYJUNKY FOR THE CORRECT ANSWER, A FIRE DOOR CLOSER.
THEY WERE PUT ON FIRE DOORS THROUGHOUT A WAREHOSE, MANUFACTURER ETC.
DURING A FIRE THE HEAT WOULD MELT THE SOLDER HOLDING THE BALL TOGETHER  AND BREAK THE LINE HOLDING THE DOOR OPEN. WHEN THE BALLS CAME APART  THE FIREDOORS CLOSED AUTOMATICALLY.
TODAYS THINGY IS 12" HIGH AND MADE OUT OF THIN METAL. EXCEPT FOR THE ONEYOU CAN SEE  THERE ARE HOLES  RUNNING UP THE SIDE WE CANT SEE...



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