Document Type and Number:
Japanese Patent JPS5251657
Kind Code:
U
Application Number:
JP13922275U
Publication Date:
April 13, 1977
Filing Date:
October 13, 1975
Export Citation:
International Classes:
G04B37/05; G04B29/00; G04B37/04; (IPC1-7): G04B29/00; G04B37/04
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