Synonyms: C6 = Am7. Cm6 = Aø7. Cm7♭5 = Cø7.
Shell chords on E and A. As shell chords, C7♭5 = C7, Cø7 = Cm7, and Cm6 = Co7.
The source for this page is available via git https://galexander.org/git/chords.git. It is maketable.pl.