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Amazon.com : Celestron - NexStar 90SLT Computerized Telescope - Compact and Portable - Maksutov-Cassegrain Optical Design - SkyAlign Technology - Computerized Hand Control - 90mm Aperture : Catadioptric Telescopes : Electronics
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Amazon.com : Celestron NexStar 90SLT Mak Computerized Telescope (Black) with 18778 AC Adapter (Black) : Electronics
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