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That is a very nice collection of pioneer era phones, too bad the 600 ohm POTS loop has all but disappeared. I used to do a lot with the dedicated lines be it dry pairs or MUX'd during my 2-way radio days. Old systems relied on 20ma DC loops that often spanned 20+ wire miles and for voice they sounded great. More modern stuff was tone controlled running -16 dbm for things like SpectraTAC receivers voters and base stations, if you knew what to listen for you could tell if it was a dry pair just by the audio quality. Now it's all digital and sounds like vocoder crap.
Growing up our home telephone number prefix was PArkway-4 which was the name of the office, we still had a live operator through the mid-70s.
Where I'm at now I can't get a copper pair to save my life. We have Century Link and it's all overpriced fiber, the alternative is MIDCO and they're just as pricey. Yeah progress is wonderful but I do miss the sound of my punchdown tool on a virgin 66-block.
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