Abstract: A compound has a tetra-hydroquinoline skeleton, the compound having inhibitory action against ferroptosis, and exerting therapeutic or preventive effect on diseases, disorders or syndromes related to ferroptosis inhibition, such as multiple sclerosis.

Abstract: The video signal stretcher comprises a signal adjusting circuit for adjusting a ratio of a synchronizing signal range to a video signal range, which video signal composes a composite picture signal together with the synchronizing signal, to become a predetermined value, whereby the DC level of the synchronizing signal is brought to coincide with the DC level of the video signal for stretching the black level of the video signal down to the pedestal level, further a composite picture signal having a set-up black level is stretched at the signal adjusting circuit so that a range of black and white levels becomes "100" against the synchronizing signal range of "40", and a DC level of a blanking period is set to a pedestal level of the composite picture signal whilst the black level of the video signal is stretched to the pedestal level, thus providing a stretched video signal having a range of 0-100 IRE with which a picture with no raised black can be displayed on a picture screen.

Abstract: A two-stroke switch to be actuated by two stroke operations comprises a first stationary terminal, a second stationary terminal, a contact element of conductive elastomeric material for establishing a current path between the first and second terminals, and an actuating member provided with a moving terminal for imparting a compressing force to the contact element. When the actuating member is first manipulated to compress the contact element axially thereof, the contact element is rendered electrically conductive, and when the actuating member is secondly manipulated to further compress the contact element which is then enlarged radially thereof, the contact element may be electrically connected to the first and/or second terminals thereby turning on the switch.