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Antique Bulb Discussion / Re: Manufacture Date: Columbia Carbon Bulb
« Last post by NZ on January 08, 2020, 01:53:36 am »Sorry about the size of the photos, I thought I had reduced them down more.
I also noticed that the tube with the patent information appears to be filled at the base with something that resembles horse hair?
I also noticed that the tube with the patent information appears to be filled at the base with something that resembles horse hair?