fail-safe
6.With a minimum of time and effort, this electronic aid enables a reliable and fail-safe gas supply
7.a fail-safe device in a nuclear weapon to deactivate it automatically in the event of accident.
9.A/A = Pneumatic Air to Air. A/SR = Pneumatic Air to Spring Return (fail-safe). E = Electric (motor driven).
10.Computer Based Interlocking is a transport equipment which use the computer to control the point, circuit and lighter, is a tools which used in the station transport by the watcher, is also a fail-safe equipment which can turn over to the safe condition when something is wrong.

