Document Type and Number:
Japanese Patent JPS4944315
Kind Code:
B1
Application Number:
JP9951669A
Publication Date:
November 27, 1974
Filing Date:
December 12, 1969
Export Citation:
International Classes:
G03B31/00; G01D15/14; G11B7/003; G11B7/125; H01L33/00; H01L33/30; H01L33/34; H01L33/36