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I'd pitch off any of those mounds.
 
Is it a can opener for small cans? Its got an adjustment on it for tension.....right? 🤔

The adjustment is for aluminum vs steel cans. The more expensive ones have just a lever to flip to change the tension. Growing up the screw type one pictured is all we ever had. I had a relatively "well to do" aunt who had the flip type, so I've seen them but never had an opportunity to use it.
 
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That's an oscillating signal generator for Charles Kettering's 1903 patent multi-modal variable frequency spark gap oscillator.

The adjusting screw provides several modes identified by the common characteristics "too much" or "not enough" and sometimes "why do you dwell on the same thing all the time, can't you get over it?"

The "it" is usually about 5000 RPM, but with Delco D-112P signal generator components 8000+ with 30 degrees dwell steady as a rock was possible if the shaft bushings and breaker plate were tight and the breaker cam was round and had the correct rate of lift profile, all necessary conditions well known to practitioners of the prior art.

Original 1903 Patent Drawing

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