Document Type and Number:
Japanese Patent JPS4945575
Kind Code:
U
Application Number:
JP8688372U
Publication Date:
April 22, 1974
Filing Date:
July 21, 1972
Export Citation:
International Classes:
G04B19/20; (IPC1-7): G04B19/20
Domestic Patent References:
| JPS4331375Y1 | 1968-12-20 |