Document Type and Number:
Japanese Patent JPS5090364
Kind Code:
A
Application Number:
JP13764574A
Publication Date:
July 19, 1975
Filing Date:
November 28, 1974
Export Citation:
International Classes:
G04B18/02; (IPC1-7): G04B17/16
Foreign References:
| GB1296285A | 1972-11-15 |