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Restore the minus symbol ‘-’ from its translation to −.
Copy the hypertext font encoding file
texmf/tex4ht/ht-fonts/mozilla/charset/unicode.4hf
to the work directory
Add the following record to the file: ’−’ ’’ ’-’ ’’
Insight.
The font files *.htf of TeX4ht produce mainly unicode entity numbers
Translation of unicode entity numbers to other encodings of symbols are requested in unicode.4hf files