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Curious if anyone has a picture of or knows what exactly were behind these rear doors marked "HP TEL" I know these were put in special locations in the 20s/30s where there were high pressure water lines, I have never seen one with the rear door open and whatever was behind it intact, I'm...

I have a vf post that came originally with one of the ERS electronic police/fire faceplates, and it had a tag on it numbered 2110, I've never seen a zero used before, that I remember, since how would a code wheel on a mechanical box send a signal of zero exactly? if it is signalled out as 10 I...