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filingDate 1987-11-09^^<http://www.w3.org/2001/XMLSchema#date>
grantDate 1989-02-28^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_65c45c512419dff6c13bbc127a42ae41
publicationDate 1989-02-28^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-4807612-A
titleOfInvention Passive ear protector
abstract A passive ear protector device for positioning in the ear of the user for protecting the ear from sounds of high intensity. The device attenuates sound in a manner which tends to preserve the natural quality of the incoming sound, in particular with respect to the natural resonance of the ear canal.
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