Document Type and Number:
Japanese Patent JPS57141490
Kind Code:
U
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Application Number:
JP2788681U
Publication Date:
September 04, 1982
Filing Date:
February 28, 1981
Export Citation:
International Classes:
H04R5/033; F41H1/00; F41H1/04; (IPC1-7): H04R5/033; F41H1/04