Document Type and Number:
Japanese Patent JPS4973906
Kind Code:
A
Application Number:
JP11497972A
Publication Date:
July 17, 1974
Filing Date:
November 15, 1972
Export Citation:
International Classes:
H04H40/54; H04H40/81; H04H1/00
Domestic Patent References:
JPS452727Y1 | 1970-02-05 |