Document Type and Number:
Japanese Patent JPS4730495
Kind Code:
U
Application Number:
JP3503071U
Publication Date:
December 06, 1972
Filing Date:
May 01, 1971
Export Citation:
International Classes:
B63B21/38; B63B21/44; (IPC1-7): B63B21/44
Domestic Patent References:
| JPS4317546Y1 | 1968-07-20 |
Foreign References:
| GB253603A | 1926-06-21 |