Curiosity teardown: Codaphone touch-tone coder

today, I'm taking a look at a telephony device from about 40 years ago. One that has been rendered obsolete a long time ago.

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This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it. ... https://www.youtube.com/watch?v=NqJq_nW1R4g