Abstract: A three-in-one smoke grenade to disperse unruly crowds that emits three smoke trails and deploys at three separate locations on the assembly site of the unruly crowd, to thereby obviate the typical defense of a crowd member throwing the smoke source to another location away from the assembly site.

Abstract: A hand grenade safety pin with attached pull ring which is installed with a rotative degree of movement and in one directional rotative traverse the pull ring clears a blocking arm so that the grenade can be detonated and, if circumstances warrant, an opposite rotative traverse restores the safety function of the safety pin.

Abstract: A smoke grenade including in an interposed position between a fuse emitting a low intensity flame and a smoke-generating composition requiring for optimum smoke production ignition by a high intensity flame, a rocket motor propellant which is ignited by the fuse and thereupon generates the high intensity flame resulting in smoke-generating service of the composition in an optimum short duration which foils manual removal of the grenade from the intended site of use.

Abstract: A stun grenade (10) for generating an explosion accompanied by light and/or blaring sound is disclosed. The stun grenade comprises a housing (12) having a body (14), a base (24) and a cover (34) defining an interior cavity (18) housing a cartridge (22) containing an explosive charge (20). A plurality of vents (30, 40) are defined in the housing (12), and a defining wall (32, 42) of each vent is angularly offset from the longitudinal axis of the cavity (18) for discharging explosive energy radially outwardly from the grenade. The stun grenade also includes a bore (25) for facilitating the releasable securement of a variety of attachments, such as a clamp (200) and a tear gas container (206).

Abstract: An unobstructed four-mirror telescope having tilted components for astronomical observations. Favorite focal ratios are in the range of about F/12 to F/20 and all surfaces are rotationally symmetric. The systems off improved aberration correction and it is possible in special cases:to realize all-spherical 500mm-systems.to eliminate image plane tilt.to eliminate anamorphic distortion.to realize big diffraction limited fields (.phi.>100mm) free from coma, astigmatism and spherical aberration.