Man pages matching name nutscan_add_device_to_device in section 3:

nutscan_add_device_to_device.3.en	debian 10 / libupsclient-dev
nutscan_add_device_to_device.3.en	debian 11 / libnutscan-dev
nutscan_add_device_to_device.3.en	debian 12 / libnutscan-dev