Man pages matching name qwtabstractscale in section 3:

QwtAbstractScale.3.en	debian 10 / libqwt-doc
QwtAbstractScale.3.en	debian 10 / libqwt5-doc
QwtAbstractScale.3.en	debian 11 / libqwt-doc
QwtAbstractScale.3.en	debian 12 / libqwt-doc