Document Type and Number:
Japanese Patent JPS5020524
Kind Code:
B1
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Application Number:
JP4376369A
Publication Date:
July 16, 1975
Filing Date:
May 03, 1969
Export Citation:
International Classes:
E21B1/04; E21B1/02; E21B3/02; (IPC1-7): E21B1/02; E21B3/02
Domestic Patent References:
| JP9004218U |