Document Type and Number:
Japanese Patent JPS5617780
Kind Code:
U
More Like This:
Application Number:
JP9851379U
Publication Date:
February 16, 1981
Filing Date:
July 16, 1979
Export Citation:
International Classes:
G02C11/06; H04R1/00; H04R1/10; H04R11/02; H04R13/00; H04R25/02; (IPC1-7): H04R1/10; H04R11/02
Domestic Patent References:
| JPS37220Y1 | ||||
| JPS5515832U | 1980-01-31 |