Abstract: A hand-held, battery-operated rotary blade saw useful for cutting plastic clips or straps which secure a face mask to a football helmet. Several configurations, having differing safety shields, are disclosed. The device is an emergency/rescue tool to quickly remove a face mask from a football helmet allowing access to the face of a football player without removal of the helmet with its concomitant risk of cervical injury.

Abstract: An improvement in corrugated structural panels, useful in the construction of tunnels, shoring, and other pressure bearing or containing structures, wherein the improvement comprises the utilization of a prism element transverse to the longitudinal axis of the corrugation in the design of the end sections of each corrugation within the panel thereby providing means to collect shear, bending and axial stresses from the corrugated panel and transmit them to the panel's supporting edge.

Abstract: A method for constructing masonry (brick, thin brick, tile, marble, stone, etc.) panels. Masonry units are placed face-down on an adhesive-coated positioning board, joint control means are applied, and a standard tilt-wall or precast panel construction is accomplished. Removal of the positioning board, adhesive, and joint control means results in a standard masonry faced wall panel which may be grouted.

Abstract: The instant invention comprises an improvement in hat racks useful for storing and carrying a soft-brimmed western-style hat adjacent to the ceiling of an automobile or truck passenger enclosure. The improvement resides in the shape of the frame of the hat rack. Said hat rack frame is shaped in such fashion that no pressure is asserted on the brim of a hat which is inserted in said hat rack, other than that pressure caused or asserted by the weight of the crown of the hat, as the hat is inserted in and rests within said hat rack in an upside-down configuration whereby the crown of the hat extends down from the hat rack into the automobile or truck passenger enclosure.

Abstract: A brush adapted for cleaning of the teeth, mouth, and gums of the user, comprising a toothbrush handle, ordinary toothbrush bristles affixed to one surface of a brush head at one end of said handle (hereinafter deemed the "brush end") in the usual and customary manner, and shorter, softer bristles, (hereinafter deemed "mouth bristles") for cleaning of the interior of the mouth and for massaging of the gums affixed to all surfaces of the above-mentioned brush head at the brush end of the toothbrush handle.

Abstract: An attachment to a rotary blade power saw (either hand-held or belt-driven) which allows said saw to be utilized in conjunction with any of the commonly available workbenches (such as that disclosed in U.S. Pat. No. 3,615,087 and sold by The Black and Decker Manufacturing Company of Towson, Md., as the "WORKMATE" all-purpose Work Center and Vise), which workbenches consist of a pair of elongated vise members mounted on a supporting structure such that one or both of the elongated vise members are moveable relative to the other, to yield the equivalent, with attendant benefits, of a common table saw.

Abstract: A particle separator which is highly efficient in the removal of suspended particulate matter from a gaseous fluid flow; which depends for its operation on centrifugal forces acting on the particulate matter which are caused and controlled by rotational direction changes induced in the fluid flow by the shape of the inner walls of the chamber which comprises the particle separator; and which derives its efficiency not only from controlability of the turning radius of the fluid flow during an induced rotational direction change, but also from recognition and utilization of the fact that particles suspended in that portion of the fluid flow which is nearest the center of rotation of the fluid flow may be unable to cross the center of fluid flow (which has a higher velocity than the outer edges of the flow) and thus be unable to separate from the flow during induced rotational direction changes necessitating a second induced rotational direction change wherein those particles which were formerly nearest the cent