chords? who the hell uses chords anymore?
Any competent rhythm section (ie one that knows 10 different ways to play F7) & any soloist who wants to see at a glance what scales/arpeggios they will use when improvising over it.
Anyway, We didn't answer the OP's question about H7 earlier. In so called German notation B corresponds to what is known elsewhere as B flat, while H is used for B natural or just plain B. H7, then, will be a B7 chord.
(see section 3 on this point)