/usr/include/Inventor/sensors/ is in libcoin80-dev 3.1.4~abc9f50-4ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/Inventor/sensors/SoAlarmSensor.h
/usr/include/Inventor/sensors/SoDataSensor.h
/usr/include/Inventor/sensors/SoDelayQueueSensor.h
/usr/include/Inventor/sensors/SoFieldSensor.h
/usr/include/Inventor/sensors/SoIdleSensor.h
/usr/include/Inventor/sensors/SoNodeSensor.h
/usr/include/Inventor/sensors/SoOneShotSensor.h
/usr/include/Inventor/sensors/SoPathSensor.h
/usr/include/Inventor/sensors/SoSensor.h
/usr/include/Inventor/sensors/SoSensorManager.h
/usr/include/Inventor/sensors/SoSensors.h
/usr/include/Inventor/sensors/SoTimerQueueSensor.h
/usr/include/Inventor/sensors/SoTimerSensor.h