4. Communications, electrical: acoustic wave systems and devices
  5. Echo systems
  6. Distance or direction finding

Maria Ritz

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Device to aid the orientation of blind and partially sighted...

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate

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Orientation aid for the blind and the visually disabled

Communications – electrical: acoustic wave systems and devices – Echo systems – Distance or direction finding
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2111253

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