Abstract: An engine life counter electrically connected to an engine restart switch through a power source of an engine. The counter includes a mechanical type counter having a coil; a quartz crystal oscillating at a stable frequency; a frequency demultiplier having an output terminal and a reset input terminal. The frequency demultiplier is connected to the quartz crystal to produce a standard frequency output. A stabilizing circuit is connected between the power source and the reset input terminal to stabilize and filter power from the power source. A transistor circuit is connected to an input of the coil and the output terminal of the frequency demultiplier for producing a series of pulses in cooperation with the frequency demultiplier. The pulses magnetize the coil at predetermined intervals.

Abstract: A measuring transducer comprises at least one pair of coded revolving metric indicators (2, 2', 2"), each consisting of a metric drum (11, 11', 11", 11"') and at least one coded revolving element. The revolving coded metric indicators (2, 2', 2") are rotatable about the same shaft (9) and the coded revolving elements are each positioned out of phase ahead at an appropriate angle with respect to the preceding revolving coded element. An electronic processing (18) prevents the sending of a signal to a display device when the signal read from the coded revolving elements has a value lower than that of any signal previously sent.

Abstract: An electromechanical pulse counter for counting applied current pulses includes a magnetizable disc-shaped armature mounted for rotation about a fixed axis. Magnetic stepping poles diametrically disposed adjacent the circumference of the armature are momentarily magnetized by a magentic winding upon application of each current pulse to establish diametrically opposed magnetic poles in the armature. Permanent indexing magnets diametrically disposed adjacent the circumference at an angular position relative to the stepping poles magnetically coact with the magnetic poles established in the armature following each current pulse to cause the armature to rotate to align the established magnetic poles with the poles of the indexing magnets. Each subsequent current pulse causes another pair of diametrically opposed magnetic poles to be established in the armature, and the armature to subsequently rotate to align the newly established magnetic poles with the indexing magnets.

Abstract: An arrangement for the self-wiping of contacts in multidigit interrogatory counters where the data are read through code wheels to contact wheels and to mechanical sliding contacts which sense the contact wheels. The improvement includes the arranging of the rotatably-mounted contact wheels to be mounted, independently from the frictional effect caused by the counting procedure during rotation on a movable shaft. Eccentrics control the movement of the movable shaft which make it possible to move the contact wheels in an oscillating manner against contact springs. This is accomplished in the overlap region for sensing the individual numbers.