Document Type and Number:
Japanese Patent JPH0452283
Kind Code:
Y2
Application Number:
JP4539683U
Publication Date:
December 09, 1992
Filing Date:
March 29, 1983
Export Citation:
International Classes:
E02F3/36; B25D17/32; E02F3/38; E21B1/00; E21B1/26; (IPC1-7): E02F3/36; E02F3/38; E21C3/20