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Tool - engineering or electrical for measurement

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11 years ago
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Description

I have a tool that maybe was for engineering or electrical for measurement.  I could be totally wrong.
It says: Patented Novelty Electric Co. Philad
It also says V over CXD = OHMS Per Foot
It has approx. decimals on one side and B&s.G and Safe AMP. numbers on the other side.
 
It was my great grand fathers and he was born about 1900 so he most likely used it in the 1920-30's I'm guessing.

Category Scientific Instruments
Medium No idea. Metal of somekind
Distinguishing marks Patented Novelty Electric Co. Philad(worn off)
Condition Good
Date Period 1920-1930??
Price Paid (If known) My great-grandfathers
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