4. Education and demonstration
  5. Communication aids for the handicapped
  6. Tactile reading aid

Bror A. Eriksson

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Apparatus for displaying letters or pictures

Education and demonstration – Communication aids for the handicapped – Tactile reading aid
Patent

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Apparatus for performing raised dot formations

Typewriting machines – Typing by other than type-face or type-die – Character formation by impact
Patent

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Circuit arrangement for power control

Electricity: power supply or regulation systems – Input level responsive – Phase controlled switching using electronic tube or a three...
Patent

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Method and apparatus for testing liquid fillings in tanks

Measuring and testing – Liquid level or depth gauge
Patent

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Profile ID: LFUS-PAI-P-1337860

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