Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work.

 
 
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Default What is it? Set 523

On Thursday, December 12, 2013 3:19:50 AM UTC-7, Rob H. wrote:
Someone would like to find out the purpose of a hole in the wall of their

basement, inside and outside photos of it along with a description are below.


I believe it is a feedthrough for old-fashioned 300-ohm television transmission line.

 
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