Here are a couple of sites that have some good information for historians:
The Bruce Crawford Memorial Switching Documentation Library -
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Interesting sites!
My dentist is still using a 25-pair (1A or 1A2) key system installed by Pacific Bell probably in the late 1970s. I asked his daughter who owned the equipment today. She thought her dad does, but didn't know for sure. I hope he isn't still paying at&t for monthly rental.
My friend's vet is using a 25 pair system too. It looks like ITT gear.
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