Wattizzit blade #3

Frank Fusco

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Mountain Home, Arkansas
Last mystery blade from the inherited 'stuff' box.
This is a real circular saw blade. Has jillions of set teeth.
Is 3 1/2" diameter with 1/2" arbor.
I'm guessing some kind of slitting blade.
Keep in mind, it is 50 to 80 years old so is not for one of the newer joining systems.
 

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This comment has nothing to do with this post but I just remembered that it was a shaker woman who invented the circular saw.
That one maybe is not so far from the original ones.
 
I saw something like that during the last century, whilst in school, we toured a manufacturing plant and they had a setup using several of that sized blades.
 
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