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The "custom series" had the base models, and the step-up was the "Sentry II" models. IIRC, from there the Zenith line had "System 3", "Advanced System 3" and later on "Digital System 3".
I have a binder full of sales literature from the early to mid 90's. I need to dig through the garage and get it out. In fact, I'm sure I have the literature on the J0920X model.
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