Document Type and Number:
Japanese Patent JPS5226930
Kind Code:
Y2
Application Number:
JP7131571U
Publication Date:
June 18, 1977
Filing Date:
August 11, 1971
Export Citation:
International Classes:
G04B37/06; G04C3/00; G04C9/00; G04G9/00; G04G21/00; G04G99/00; (IPC1-7): G04C3/00
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