A number in parenthesis represents the number of lines above the right numeral box enclosed by retouching
Retouch of the Upper Right Vertical Line
3UR23 ~ "From line 1 to the bottom, a hairline off the upper right corner (0)"
RB/GM
A number in parenthesis represents the number of lines above the right numeral box enclosed by retouching
Retouch of the Upper Right Vertical Line