Title:
【考案の名称】真空層を用いたしや音板
Document Type and Number:
Japanese Patent JPS59131798
Kind Code:
U
Inventors:
Tsutomu Urai
Application Number:
JP2614783U
Publication Date:
September 04, 1984
Filing Date:
February 23, 1983
Export Citation:
International Classes:
G10K11/16; (IPC1-7): G10K11/16