Abstract: A horological mechanism (1000) with a first train (100) and a first output wheel set (101), a second train (200) and a second output wheel set (102), for alternately displaying on a display (800, 8, 28) a first and a second indication respectively specific to the first train and second train, by a switching and coupling mechanism (500), including two input wheel sets (1; 2) connected to the output wheel sets, which includes a sliding wheel set (5) capable of moving under constant strain between the two input wheel sets, and cooperating alternately and exclusively with either one, selected under the action of a command from a user, to establish a driving connection between the input wheel set engaged with the sliding wheel set at the given moment in time, and a display (800, 8, 28) to produce a switchable display.

Abstract: A horological mechanism with a first mechanism (100) and a first output wheel set (101), a second mechanism and a second output wheel set (102), for displaying a first or a second indication specific to the first mechanism (100) or second mechanism (200), by a switching and coupling mechanism (500), including, on a coupling arbor (937, 938), two input wheel sets (1; 2) connected to the output wheel sets (101; 102), a sliding wheel set moving under constant strain between these input wheel sets (1; 2), and cooperating alternately and exclusively, by clicking in a single angular position per revolution, with either one, selected under the action of a command from a user on a controller, to establish a driving connection between the input wheel set engaged with the sliding wheel set at the given moment in time, and a display means.

Abstract: A device for cleaning the surfaces of a moving flanged reel consists essentially of an assembly of nozzles which are provided with electrical discharge means and direct charged gas onto the reel and are arranged adjacent to the path along which the reel is transported, and a suction device for withdrawing the particles, etc. removed from the reel. Other embodiments of the invention concern the positioning of the nozzles, the arrangement of the suction device, the positioning of the reel during the cleaning process and an advantageous device for conveying a plurality of reels to be cleaned one after the other.The cleaning device of the invention can be used to clean flanged reels of all types on which strip materials susceptible to dust such as photographic film and magnetic tape, especially magnetic tape for date and video recording, are to be wound.