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A61M 21/02

Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis for inducing sleep or relaxation, e.g. by direct nerve stimulation, hypnosis, analgesia

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data.epo.org/linked-data/def/cpc/A61M21-02
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A61M 21/00
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