Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted

Regulating, controlling or safety means > Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity > Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted

Regulating, controlling or safety means (controlling combustion engines F02D) > Regulating or controlling by varying working-fluid admission or exhaust, e.g. by varying pressure or quantity > Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted