Document Type and Number:
Japanese Patent JPH0471085
Kind Code:
U
Application Number:
JP11500290U
Publication Date:
June 23, 1992
Filing Date:
October 31, 1990
Export Citation:
International Classes:
H04N7/18; G08B13/00; H04Q9/00; (IPC1-7): H04N7/18; G08B13/00; H04Q9/00
Domestic Patent References:
| JPS634790A | 1988-01-09 | |||
| JPS6370684A | 1988-03-30 |
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