Abstract: An apparatus for the mechanical cleaning of the interdental spaces by dental floss comprising an outer holder containing a delivery reel of the fresh dental floss and a take-up reel of the worn-out dental floss, a drive mechanism for reciprocating the operating length of the dental floss between the arms of a fork to be positioned within the mouth in the interdental spaces, and a mechanism provided with friction device for rotating the delivery and take-up reels as well as the driving wheels transmitting the movement of the drive mechanism to the delivery and take-up reels, an outside case including the drive mechanism for the above-mentioned reciprocation and the power supply battery, a support base for two holders and a drive case carrying an induction coil for recharging the battery and including two sockets for holders.

Abstract: A heater for heating a substrate in a supercritical fluid reactor includes a heater body having a heater chamber initially open to the interior of the reactor. The heater chamber is sized to match the substrate and includes a seal around its perimeter that seals against the perimeter of the substrate and forms a closed heater chamber with the backside of the substrate. A heating element, insulated from the heater body, preferably with pyrolytic graphite, is located in the heater chamber to heat the substrate from the backside. A clamp ring with a seal around its inner perimeter cooperates with the heater body to seal the substrate to the heater body. The heater is preferably spaced apart from the substrate, as well as the walls of the eater chamber and the insulator, to provide uniform heating by transferring heat through the supercritical fluid.

Abstract: A device for aiding in the injection and removal of printed circuit boards from card cages. The device comprises in combination, anchor means for affixing the device both to the printed circuit board and to the cage and lever means adapted to develop linear inward and outward directed forces with a single degree of freedom so that no rotational bending forces are developed on the pins of a plug on the board when they are injected into or ejected from the holes of a mating socket in the cage.

Abstract: An automatic tool changing system and apparatus for turret type and block tool type lathes. The invention generally comprises an improved automatic indexable turret having a plurality of tool clamping units actuatable for engaging and disengaging a tool, an automatic indexable tool storage/feeder mechanism for supplying and receiving tools, and an automatic tool manipulating and transporting means disposed for operative association with said turret and said tool storage/feeder mechanism for selectively exchanging tools in response to a programmed numerical control unit or system.

Abstract: A safety extension is adapted to be mounted by various adjustable means to the upper rungs of a ladder or the inside of a manhole. The safety extension comprises a rod which is moveable in a sleeve between extended and retracted positions. A counterbalance means mounted in a particular manner is optionally provided to facilitate moving the rod to the extended position with maximum ease and safety. Adjustable mounting means are provided to accommodate ladders of differing rung spacing and rung diameter.

Abstract: An improved air metering nozzle assembly for air bearings wherein the metering orifice is formed in a flat disc separate from air supply elements and is readily removable and replaceable.

Abstract: The process provided for the production of high-purity 1,3-bis-(.beta.-ethexyl)-5-amino-5-methyl-hexahydropyrimidine, also known as hexetidin, by reacting 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine with naphthalene-1,5-disulphonic acid in a solvent to selectively precipitate the novel intermediate compound 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine-naphthale ne-1,5-disulphonate, which is separated off, treated with aqueous alkali to produce 1,3-bis-(.beta.-ethylhexyl)-5-nitro-5-methyl-hexahydropyrimidine, and subsequently hydrogenated to produce high-purity hexetidin.