Man pages matching name qwtpickermachine in section 3:

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