Document Type and Number:
Japanese Patent JPS52155575
Kind Code:
U
Application Number:
JP6524576U
Publication Date:
November 25, 1977
Filing Date:
May 20, 1976
Export Citation:
International Classes:
G04G3/00; G04C9/00; G04C15/00; G04G5/02; (IPC1-7): G04C9/00; G04C15/00
Domestic Patent References:
| JPS4837170A | 1973-06-01 | |||
| JPS4812060A |