Document Type and Number:
Japanese Patent JPS53981
Kind Code:
Y2
Application Number:
JP2285873U
Publication Date:
January 12, 1978
Filing Date:
February 23, 1973
Export Citation:
International Classes:
G03B21/64; G03B23/06; G03B23/10; (IPC1-7): G03B21/64; G03B23/06
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