发明名称 Hearing aid filter apparatus
摘要 An apparatus to effect coverage of a hearing aid housing received within a cavity of the sock housing to effect filtration of various airborne contaminants. A modification of the invention includes hair filaments arranged and mounted to the sock structure to effect coverage of the sock member and its camouflage.
申请公布号 US5263090(A) 申请公布日期 1993.11.16
申请号 US19920829312 申请日期 1992.01.31
申请人 HUGHES, RICHARD A. 发明人 HUGHES, RICHARD A.
分类号 H04R25/02;(IPC1-7):H04R25/00 主分类号 H04R25/02
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