Document Type and Number:
Japanese Patent JPS5249684
Kind Code:
B2
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Application Number:
JP6218471A
Publication Date:
December 19, 1977
Filing Date:
August 16, 1971
Export Citation:
International Classes:
H04Q3/58; H04Q3/62; H04Q3/72; (IPC1-7): H04Q3/72; H04Q3/62