Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine
Patent
1997-11-06
1999-12-07
Holtje, Martie K.
Office supplies; artists and teachers materials
Teaching material
Sensory feedback, e.g., audio-visual teaching machine
D19 59, D14192, D14195, 1907
Patent
active
D04174658
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Dinenberg Robert Eric
Kreitz Keith
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