Abstract: A lock for the door of an automobile which is provided with an electrical signalling circuit for indicating to the driver whether the lock is opened, partially closed, or fully closed. The lock has a main supporting body. A movable member is held on the body and assumes a first position when the lock is closed, a second position when the lock is partially closed and a third position when the lock is open. The lock also includes a magnet switch which is connected in the electrical signalling circuit. A projection is connected with the movable member such that when the movable member is in the first position at which the lock is fully closed, the projection is interposed between the reed relay and the permanent magnet and this interrupts the magnetic flux lines between the magnet and the reed relay contacts, causing the contacts to open and opening the electrical signalling circuit.

Abstract: A liquid fuel for internal combustion engines allowing better combustion and increased purity of exhaust gases, especially in terms of CO concentration and freedom from unburned or only partially burned hydrocarbons. The fuel is a conventional hydrocarbon based fuel, like gasoline and diesel oil, containing at least one additive which reduces the surface tension of the liquid fuel.