Abstract: An arithmetic teaching device consisting of a rod having hand movable spaced collars slidable thereon and having sequentially spaced numbers therealong corresponding to the collars whereby the numbers indicate visually the arithmetic calculation of preceeding manipulated numbers.

Abstract: An air distributing device mounted into the sloping wall of a hopper containing finely divided material, such as flour or cement, aerating and causing the discharge of the material with a pressurized air flow and keeping the material in constant motion toward the discharge outlet of the hopper, the air distributing device being substantially hemi-spherical in form and providing a wide distribution of the pressurized air.

Abstract: A bottle dispensing utensil having a long handle having a divided blade at one end thereof disposed in a plane normal to the axis of the handle, the blade being retractable in being disposed through a fairly narrow bottleneck and being sufficiently resilient to resume its normal span and being sufficiently rigid to dispense from a bottle materials of such viscosity as catsup and salad dressings.

Abstract: A fuel injection structure for dual fueled combustion engines having access to the combustion chamber of a cylinder to automatically supplement a liquid fuel with a gaseous fuel, the structure being adapted to supply the gaseous fuel by a programmed electronic control circuit which regulates the operation of fuel injection to be in accord with certain sensed engine operation parameters to determine from said parameters a desired gaseous fuel flow rate and a signal responsive to said parameters actuating a valve to control said flow.

Abstract: A quickly attachable longitudinally split coupling structure to connect a pair of pipe ends for a leak proof connection, the coupling structure requiring only a tapping tool for installation or removal.

Abstract: A bale wire twister having a shaft mounted gear internal of the housing thereof being manually operable and an aligned slot through the housing and into the gear and into the shaft supporting the gear, the slot receiving a double strand of baling wire, a hub depending from the gear having an arcuate slot partially thereabout and projection from the shaft into the slot whereby a hand crank moves said gear and hub to overlie the slot and lock in the wire in the slot, the hub engaging the projection to cause the shaft to rotate and twist the wire locked therein, the slot being realigned to release a twisted wire.

Abstract: A reusable self securing plastic holding device for mounting onto a clean smooth surface and having a particular structure which contributes substantial load bearing capacity in being particularly adapted to resist shear force or peel back.

Abstract: A self locking file folder suspension hanger made up of two u-shaped end members supporting a pair of transversely spaced horizontal suspension members, the end members having upwardly extending free ends having doubled over end portions with the upper closed end portion being doubled over to form a pair of spaced closed upper ends and a depending closed end, the suspension members being disposed through and engaging the undersides of the upper closed ends and a cross member at each end underlying the ends of said suspension members, said cross member having angled end portions being disposed to underlie said suspension members in a downwardly angled position and being rotated axially through 180.degree. to have its angled ends bear up against the suspension members to engage and self-lock the same in a pressure action against the overlying upper closed ends.

Abstract: A long handled tool having a blade member at one end having a leading undercutting knife edge to sever from a web a broken end portion thereof which is wrapped about a drying roller and having an adjacent portion of the blade having an extended tapered curved terminal portion, the knife edge being inserted between layers of the web wrapped about the roller and the roller itself, moving the blade member along the roller the width of the web severing the web and then moving the blade member to one side of the cut to engage the wrapped portion of the web with the curved terminal portion to pull the broken web off of the roller.

Abstract: A battery charger which senses the percent of charge in a battery, selects automatically on a continuous basis a constant output charging voltage by switching between two different taps of a transformer, limiting the output voltage not to exceed 17.5 volts to protect the electronic components of the vehicle having the battery therein, against the adverse effects resulting from overcharging and compensating for changes in temperature to maintain a constant level of voltage in continuously charging a battery to the point of being fully charged.

Abstract: An alignment plug recessed into a concrete floor to be level with the floor surface having a removable cap to uncover permanent reference lines for aligning machinery.

Abstract: A battery charger embodying a meter which states the time required to charge a battery and which times the battery charge.

Abstract: A multi-level display rack structure which holds merchandise at two or three levels on grocery shelves and upon which packaged goods are carried and spring urged backing members move the merchandise to the forward edges of the rack at each level as items thereon are removed by purchase.

Abstract: A flat key pick resistant cylindrical lock structure which comprises a plug, a sleeve and a housing. The housing is bored off center to receive the sleeve and thus make room for biased split pin tumblers embodying false segments and further, limited misleading internal rotational movement occurs when an attempt is made to pick the lock. Also two shear lines between the plug and sleeve and between the sleeve and housing must be cleared before an unlocking of the lock can be accomplished.

Abstract: A hand operated grenade launcher having a multiple round disposable magazine, having the magazine forming an extension of the barrel in cooperatively positioning a cartridge in firing position, having a pump action barrel travel a shorter distance than a cartridge length and having an automatic advancement and ejection of the magazine.

Abstract: A decorative natural wood covering structure overlying an out of doors exposed mailbox.

Abstract: A windshield mounted bracket to removably and adjustably hold a radar detector including suction cups for removable windshield attachment, an adjustable strap bracket having flanged bottoms to seat into corresponding grooves in side walls of the detector housing and a rotatably adjustable connecting ball hinge.

Abstract: A spring wire toe nail correcting appliance having a central inverted V-shaped bridge portion have a pair of laterally extending arms having reversely downwardly curved tip portions, the arms defining a transverse curvature less than that of a toe nail, the tip of the V-shaped bridge engaging the nail to exert leverage when the tip portions engage the corners of the toe nail causing said corners to become uplifted.