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Gear-Operated Declination Adjustment System graduated 0-360 with two-degree intervals; parallax error can be eliminated by means of arrangement of luminous points and color lines; five-second damping.
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Gear-Operated Declination Adjustment System graduated 0-360 with two-degree intervals; parallax error can be eliminated by means of arrangement of luminous points and color lines; five-second damping.
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