Document Type and Number:
Japanese Patent JPS5317807
Kind Code:
B2
Application Number:
JP6022075A
Publication Date:
June 10, 1978
Filing Date:
May 22, 1975
Export Citation:
International Classes:
E01D19/02; E01D21/00; E04G9/00; E04G11/08; E04G13/02; E04G17/02; E04G17/04