U.S. federal trademark · Serial No. 73671719 · Reg. No. 1378179
HAND HELD DETECTOR FOR USE IN CONJUNCTION WITH PICTORIAL LEARNING MATERIALS WHICH PROVIDE A FIRST SOUND WHEN ITS READING HEAD IS PRESSED AGAINST A CONDUCTIVE ZONE AND A SECOND DIFFERENT SOUND WHEN THE READING HEAD IS PRESSED AGAINST A NON-CONDUCTIVE ZONE
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