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Hello, I have a Western Electric Lightning resistor model #29-B on the ceiling in my basement and I'm trying to figure out how old it is. I have seen pictures online of several ones similar to it that have patent dates stamped on the back in red letters (usually around 1914-1917) but mine only reads "29-B" in black lettering on the back of it. I was wondering if anyone else has seen one like mine without the red patent dates on the back? Thank you!
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