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CPC Subgroup
G09B 23/04

for geometry, trigonometry, projection or perspective (for surveying G09B25/06)

Full Title

Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes (in the nature of toys A63H) > for mathematics (for statics or dynamics G09B23/08) > for geometry, trigonometry, projection or perspective (for surveying G09B25/06)