Title:
【考案の名称】拡径孔さく孔装置
Document Type and Number:
Japanese Patent JPS5973487
Kind Code:
U
Inventors:
Takao Shibukawa
Yoshio Morishima
Katsuki Mitsutoshi
Yoshio Morishima
Katsuki Mitsutoshi
Application Number:
JP16938382U
Publication Date:
May 18, 1984
Filing Date:
November 08, 1982
Export Citation:
International Classes:
E21B10/32; E21D20/00; (IPC1-7): E21B10/32; E21D20/00
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