MANIPULATIVE MATHEMATICAL MATERIALS NAMELY, BLOCKS, SQUARES, [DISCS, ]RECTANGLES, [TRIANGLES, ]STRIPS, BOARDS,[ DOMINOES, CIRCLES, ELLIPSES, ]RODS AND WRITTEN INSTRUCTIONAL MATERIALS RELATING THERETO

Materials for the Teaching of Mathematics Comprising Colored Rods of Various Lengths [ and Colored Discs ] Sold as a Package with One or More of the Following Printed Items: Instruction Books, Wall Charts and Film Strips Describing the Use of the Rods; [ and Discs ] Problem Books Containing Problems Solvable Through the Use of the Rods; [ and Discs ] and Charts Bearing Various Geometrical Designs (Geo-Boards)