This standard is also valid for double-tube core barrels, type BT (see SIS 74 13 40). The standard corresponds to a proposal prepared by ISO/TC82/WG5. When the result of the ISO work is available a revision of this standard may be considered.
SIS 74 13 23 E-1969 history
1969SIS 74 13 23 E-1969 Core drilling equipment Core barrels, type B Core lifters