Did you check the Text and Font dialog? If the fonts are part of a
family, the different variants will be listed under the "Style" section
of the dialog. The text toolbar allows access to only one "bold" and one
italic/oblique variant of a family.
Yes, I have checked it. Actually, it doesn't see the whole font family.
It only sees the two fonts "Neo Tech Semilab" and "Neo Tech Bold
Semilab", that are not part of the family, but they were made by a
designer company for us by selecting letters from Neo Tech and Neo Tech
Alt. Unfortunately they didn't make a good job, as there are letters
that are selected from the wrong font, and the spacing between the fonts
are sometimes buggy, and they don't behave as part of the family (eg. we
cannot switch between them by setting the letters boldface, they are
So, the whole family is invisible. See: