Abstract: A locking cap for the gasoline tank of a automotive vehicle, having an electrically actuated device for unlocking the cap, the unlocking device having an operative electrical circuit including an electrical switch actuated by the ignition key of the vehicle. The switch can be closed only at a position of the key corresponding to an "engine-off" condition, so that the cap cannot be unlocked with the engine running. The unlocking device includes a hammer-blow apparatus for assisting in the opening of the cap in the event it should be frozen shut.

Abstract: In combination with the barrel of a shotgun, a sighting rib extending along said barrel thereabove, and pivoted to said barrel at its rearward end on a horizontal transverse axis, and one or more short links extending angularly between the barrel and rib at their forward ends, the links being both pivoted and longitudinally slidable relative to the rib and barrel to permit changing of their angularity adjust of the angularity of the rib to the barrel, and mechanism for securing one end of each link against pivotal and sliding movement, whereby the angularity of the rib to the barrel may be fixed as desired, while leaving the opposite end of each link freely slidable to permit unequal longitudinal thermal expansion of the rib and barrel.