Abstract: A two piece garment button having a base that is sewn to the garment and an interchangeable button head having a key that is slidably received in the base and locked therein to form an assembly capable of being passed through a buttonhole and thus closing the garment.

Abstract: The invention provides a closed center rotary valve and a power-assisted steering mechanism for a motor vehicle incorporating the rotary valve.The closed center rotary valve comprises cooperating relatively rotatable sleeve and core members having cooperating axially-extending grooves therein and means relatively biassing the members towards a neutral position.Said grooves comprise at least one inlet groove connectable to a source of fluid under pressure, a cylinder groove angularly spaced from the inlet groove on each side thereof and connectable to opposite sides of a double-acting piston-and-cylinder, and a return groove in overlapping relation with each of the cylinder grooves in the neutral position of the valve and connectable to a reservoir for the fluid under pressure, the inlet groove being closed from communication with the cylinder and return grooves in the neutral position of the valve.

Abstract: A bone-setting assembly essentially comprised of a pair of tubular members adapted to be inserted in the intramedullary passages of the respective parts of a broken bone, and a central connecting and aligning pin that is arranged to be slidably received in the interior passages of the tubular members. The tubular members are driven into position in the bone passages and a portion of the exterior surface of each member is roughened to firmly fix the member in the bone. The interior passages of the tubular members are preferably square in cross section and the central pin has a conforming square cross section so that there can be no relative rotation between the tubular members and thus between the parts of the broken bone. The central pin is threaded over approximately half of its length and a nut is threaded on this portion of the pin.

Abstract: A hand weapon that appears to be in innocuous key carrying device. The device includes a hollow handle member having a removable end cap to which a number of keys are connected through an axially movable plunger that passes through the cap into the interior of the handle. The inner end of the plunger is secured to one end of a relatively long cord normally stored in the handle, and the other end of the cord is secured to the handle itself. Coacting means are provided on the plunger and handle for releasably holding the end cap in position on the handle but the user can release the end cap which permits the keys to be hurled at an attacker.

Abstract: A cutting tool for use in conjunction with the propeller assembly of a boat to prevent underwater foliage from fouling the drive mechanism of the boat. The shank end of the tool is secured to the motor housing and supports the cutting blade end thereof in close proximity with the propeller hub. As the hub rotates, underwater foliage encountered by the propeller assembly is swept into contact with the cutting edges of the blade whereupon the foliage is cut and the cutting thrown away from the motor.