Document Type and Number:
Japanese Patent JPS52169292
Kind Code:
U
Application Number:
JP7875276U
Publication Date:
December 22, 1977
Filing Date:
June 16, 1976
Export Citation:
International Classes:
G10K11/16; B63B3/14; B63B15/00; B63B29/02; G10K11/02; (IPC1-7): B63B29/02; B63B3/14; G10K11/02