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"The LM13600 has designed by Bill Gross and myself in less than 5 minutes." Which is a humbling anecdote about a classic OTA amplifier. But, as the story goes on, it makes sense: it's just "two of something else" with a buffer, and the design brief was "make something somebody can learn to layout 16-pin DIP with". Didn't matter what the thing was, just needed to have 16 pins. And there you are.