Abstract: There is provided a device for assistance with maintenance for an aircraft engine, including computer means; display means; and a human-machine interface. The human-machine interface includes remote movement recognition means to remotely identify a movement or a position of a human operator and to provide corresponding identification data; and a control module, to provide a control command to the computer means in response to the identification data. The computer means are designed to control the display on the display means, of assistance information for maintenance of an aircraft engine, in response to the control command. The computer means are also designed to control holding the content of a display shown on the display means. A method used with such a device is also provided.

Abstract: Magnetic characters arranged in a row on a check are read in an apparatus effecting relative linear displacement between the check and a magnetic reader. The displacement is effected either by manually removing the check from the apparatus, or by manually moving the reader.

Abstract: A bill publishing apparatus is disclosed, for payment by use of a bank ca including an element for receiving a bank card, an element for receiving a bill, a printing drum with rotary wheels each carrying a series of characters and a mobile carriage carrying a printing roller. Each drum wheel is fast for rotation with a coding disk carrying a series of codes associated respectively with the characters of the wheel. An element for reading the codes and an element controlled by the reading element are provided for recording an angular positions of the wheels and so values of the characters.

Abstract: System constituted by a reading and/or writing apparatus and a removable sette for the latter, provided respectively with two couplable connector elements. The apparatus is equipped with a fixed guide member and a drive member mounted on a movable lever and both members are adapted to cooperate with a trough of the cassette to ensure rectilinear driving of the latter and correct cooperation of the two connector elements during the positioning or the extraction of the cassette.

Abstract: The compounds of the formula: ##STR1## in which R.sub.1 represents a dichloromethyl or trichloromethyl group, X.sub.1 represents a chlorine or fluorine atom, X.sub.2 represents a chlorine or fluorine atom, X.sub.3 represents a hydrogen, chlorine or fluorine atom, R.sub.2 represents an amino group NH.sub.2 or a ##STR2## group, in which R.sub.3 represents a hydrogen atom or an alkyl, haloalkyl, alkenyl, haloalkenyl, arylalkyl, arylhaloalkyl, cycloalkyl, halocycloalkyl, alkoxyalkyl, haloalkoxyalkyl or aryl group, this latter being unsubstituted or substituted by one or two halogen atoms or by an alkyl, alkoxy, nitro or haloalkyl group are antidotes against herbicides.