Document Type and Number:
Japanese Patent JPS538001
Kind Code:
Y2
Application Number:
JP2982372U
Publication Date:
March 01, 1978
Filing Date:
March 11, 1972
Export Citation:
International Classes:
E21B19/086; B23K9/12; B23K37/053; E21B3/00; E21B3/035; E21B19/08; (IPC1-7): E21B19/08
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