AID ON GEOGRAPHY Russian patent published in 1994 - IPC

Abstract RU 2017229 C1

FIELD: physics. SUBSTANCE: teaching aid on geography has a flat base and a set of horizontal planes whose edges are made in accordance with the relief. These horizontal planes are positioned inside a corresponding horizontal plane and form an opening or a hollow in it. The aid changes the design of the known aid. EFFECT: widening of the field of application for the study of hollows and improved visual method. 2 dwg

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RU 2 017 229 C1

Authors

Shebalin Jaroslav Petrovich

Dates

1994-07-30Published

1991-06-11Filed