4. Organic compounds -- part of the class 532-570 series
  5. Organic compounds
  6. Heterocyclic carbon compounds containing a hetero ring...

Lutz Konig

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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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Process for the preparation of 1-(2-hydroxyethyl)-2,2,6,6-tetram

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
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Profile ID: LFUS-PAI-P-1750066

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