Said differential selection signal comprises a first selection signal and a second selection signal inverted relative to the first selection signal.

A bidirectional, multiple speed hydraulic actuator, including a differential piston (10, 24, 26).

A tractor locking differential (12, 18) is controlled by a solenoid operated hydraulic valve (34).

A controller (25) provides a control signal that varies in accordance with an interframe difference motion indicator signal (23) and the inverse of the occupancy of the buffer.

A control (51, 151) for automatically effecting a lock-out of an interaxle differential (14) of a wheeled vehicle (10).

A differential signal is produced which is the difference between the prediction and the incoming data sample, this differential signal being quantised into a signal having a lesser number of bits to the differential signal.

A full wheel drive system allows to suppress as desired the differential effect.

A multiple drum winch is driven by epicyclic differential gearing.

The differential transformer is electrically connected to an indicator (24).

The control system (29) also maintains the differential (22) in an unlocked condition when the vehicle transmission (16) is in neutral or is shifted to a high speed range.

Said differential means may be of the hydraulic or mechanical type and is servo-connected to a gyroscope.

Numerous differential diagnoses are given in the form

Newton provided them by inventing the differential calculus.

Namely the difference between the interior pressure and the exterior pressure.

The amplifier (20) includes transconductance transistors (22, 24) for receiving a differential input signal.