See also:

Telephone
...

For your own safety
Maintenance and repairs Advanced technology, e.g., the use of modern materials and high-performance electronics, requires suitable maintenance and repair methods. Therefore, have this work perfo ...

System limits
Be alert Due to system limitations, warnings may be not be issued at all, or may be issued late or improperly. Therefore, always be alert and ready to intervene; otherwise, there is the danger ...