Door Knob Alarm?

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32winspl

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Nov 4, 2007
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Wausau, Wi.
A number of years ago I was at a gun-show, and one of the sellers was offering a small, electric alarm that was designed to be placed on the inside knob of your door. The instant that anyone touched the outside knob, the alarm would screech and let you know that someone had touched your door knob.
Anyone here know what company made this alarm and if it is still made/available?
 
I'm not sure how this is gun related, but if you search for "door knob alarm" in Google, hundreds of entries come up.
 
I like this one:
hd_chuck.jpg


:D
 
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