Abstract: A timepiece including a case that accommodates a movement including a lower peripheral bearing surface, the case including a case middle to which a back cover and a crystal are respectively assembled. The timepiece further includes a clamping element including a lower retaining surface and the movement includes an upper peripheral bearing surface, the lower retaining surface of the clamping element and the upper peripheral bearing surface being in mutual contact. The back cover includes an annular peripheral shoulder, against which is affixed the lower peripheral bearing surface of the movement, which is compressed between its lower peripheral bearing surface and its upper peripheral bearing surface respectively by the annular peripheral shoulder of the back cover and the lower retaining surface of the clamping element.

Abstract: An instrument for counting duration for differentiated phases, including: plural mechanisms for recording a time duration, each actuatable, for activation and deactivation thereof, by a first controller; a general controller for controlling, from an inactive position in which all the recording mechanisms are deactivated, activation of only one of them, selected by a selector, and for again controlling, at a final moment, deactivation of all the recording mechanisms; a switch configured, during a command for activation of one of the recording mechanisms, to trigger the deactivation of all other recording mechanisms and to save totality of the recorded times, counted on each of the recording mechanisms. The selector is configured to be controlled by a user or/and by a measuring mechanism or/and by a signal to trigger the activation of one of the recording mechanisms.

Abstract: A timepiece including a case that accommodates a movement including a lower peripheral bearing surface, the case including a case middle to which a back cover and a crystal are respectively assembled. The timepiece further includes a clamping element including a lower retaining surface and the movement includes an upper peripheral bearing surface, the lower retaining surface of the clamping element and the upper peripheral bearing surface being in mutual contact. The back cover includes an annular peripheral shoulder, against which is affixed the lower peripheral bearing surface of the movement, which is compressed between its lower peripheral bearing surface and its upper peripheral bearing surface respectively by the annular peripheral shoulder of the back cover and the lower retaining surface of the clamping element.

Abstract: An instrument for counting duration for differentiated phases, including: plural mechanisms for recording a time duration, each actuatable, for activation and deactivation thereof, by a first controller; a general controller for controlling, from an inactive position in which all the recording mechanisms are deactivated, activation of only one of them, selected by a selector, and for again controlling, at a final moment, deactivation of all the recording mechanisms; a switch configured, during a command for activation of one of the recording mechanisms, to trigger the deactivation of all other recording mechanisms and to save totality of the recorded times, counted on each of the recording mechanisms. The selector is configured to be controlled by a user or/and by a measuring mechanism or/and by a signal to trigger the activation of one of the recording mechanisms.