Today’s inspection had a natural gas furnace. I am having trouble finding any information about the company let alone a manufactured date. I was about to find catalogs from 1935 and 1948 but no other info. Has anyone else come across this brand of furnace from Pennsylvania Furnace & Iron Co.?
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Rick, it looks like 50/60s vintage to me, So, beyond its expected life. 
For grins, I found where they apparently weren’t bargaining collectively in 1936:
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Yes, wicked old, and FWIW, you need a better camera…