Document Type and Number:
Japanese Patent JPS4720222
Kind Code:
U
Application Number:
JP1499471U
Publication Date:
November 07, 1972
Filing Date:
March 08, 1971
Export Citation:
International Classes:
G03B17/00; (IPC1-7): G03B17/00
Foreign References:
| GB706196A | 1954-03-24 |