Abstract: Telescopic grenade, characterized in that it features means (29-35) that ensure safety in the transport/storage position and means (22-19-20-21-29) that determine, under the effect of the propellent gasses, a relative transfer between the component parts (5-15) of the tail (2).

Abstract: Device for adjusting the step of the mast of a sailboard or similar, characterized in that it comprises a slider receiving the foot of the mast, the slider being associated with a slide which may be secured to the hull of the board, a friction locking means acting on the slider for securing it relative to the slide and a control member provided for varying the friction of the locking member on the slider, thereby allowing shifting of the latter to the slide.

Abstract: Safety device for oil filters and the like, having a casing containing a filtering cartridge, wherein a piston is entered with a frictional fit in said casing against a spring means, said piston being forced towards the bottom of the casing into a waiting position by the insertion of said cartridge; at least one oil passage being provided through said piston, said spring means returning the piston in its active position upon removal of the cartridge from the casing and a means being provided for releasably locking said piston in its active position.

Abstract: Closing device for the slot through which passes the cocking lever of automatic weapons, the slot being provided in the casing of the latter, characterized by the fact that it is mainly made up of: a shaped flap provided with a cut-out portion at each of its ends; two posts which are integral with the casing and pass through each of aforesaid cut-out portions; and a spring hooked by its ends onto aforesaid posts and attached in its center to aforesaid flap, so as to press the latter against the casing and to stress it towards its closing position of the slot.