4. Photography and optical equipment
  5. Projector or viewer
  6. Element or attachment

Eddie J. Marfori

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Display accessory for overhead projector system

Photography and optical equipment – Projector or viewer – Element or attachment
Patent

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Electronic quiz unit for attachment to books

Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine
Patent

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Profile ID: LFUS-PAI-P-1632742

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