This model consists of two triangular pieces hinged at on vertex. It may be arranged as a triangle or a quadrilateral.
There is a model of a triangle with its medians which Wheeler variously designated 6K and 12TD. It consisted of six pieces which arrange to form a triangle. Models MA.304723.745, MA.304723.746 and 1979.0102.189 are the pieces of this partially hinged model.
A drawing ot 12TD, dated April 2, 1932,is in 1979.3002.55 (folder 1).
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