Dobro and C m(maj9)
No bar position in GBDGBD spells C m(maj9).
C m(maj9) spells C – D – D# – G – B, but the dobro chair has no bar for it: at every fret of the GBDGBD neck, and on every short slant, the strings that land on its tones leave one out or too few of them ring.
In a country arrangement that is an ordinary night's work — the dobro plays the part of the chord the bar can reach, or a single-string line through it, and lets the guitar and the rest of the band carry the chord. This page draws no grip a steel cannot hold.