U.S. federal trademark · Serial No. 73076306 · Reg. No. 1059838
TEACHING AIDS FOR THE METRIC SYSTEM-NAMELY, CUBIC DECIMETRE BOXES, CLASSROOM WALL POSTERS, GRADUATED CYLINDERS AND TEACHERS' MANUALS
TEACHING AIDS FOR THE METRIC SYSTEM-NAMELY, FILM STRIPS, METRIC RULERS AND METRIC TAPE MEASURES
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