shenma
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3004 Plane analytic geometry demonstrator
3001 Plane geometry demonstrator
315 Plane geometry demonstration plate
21053 Demonstration of inclined plane trolley
21037 Plane lift demonstrator
3001 Plane geometry demonstrator
29036 Plane mirror and support
29001 Inclined plane
28006 Celestial instrument Nine planets
34002 Plane terrain globe
34002-1 Plane terrain globe
34005 Plane dual-purpose globe
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