Abstract: The invention is a dental flossing device comprising a segment or strand of dental floss with two gripping means or grippers secured to the segment and spaced apart approximately three and a half inches. Preferably the grippers are small, flat tablet-like elements, having dimensions suitable to be gripped between two fingers of a user's hand; such grippers may be injection molded directly around or onto the floss. In manufacture, very long strands of dental floss will have such grippers secured along their length at selected intervals, and then packaged in a dispenser which allows removal from the long strand, of a single segment with two spaced grippers.

Abstract: A device for intubation of the tracheal passage comprising a tube through which gas can be administered and an occlusion means to seal the annular space around the tube when it is positioned in a tracheal passage. The occlusion means is formed as a canopy of flexible material having a top part traversed by said tube in an air-tight junction with an inflatable annular chamber extending around the wall of the canopy. Inflation of this chamber distends the canopy against the tracheal wall and simultaneously creates a second annular chamber between the inner surface of the canopy and the outer surface of the tube. The bottom of the canopy is open during positive pressure ventilation, for allowing an upward flow of gas via the annular space into said second chamber to inflate and distend the canopy against the tracheal wall independently of inflation of said first annular chamber.

Abstract: A cold-gas refrigerator of the type in which the displacer is driven by pressure fluctuations generated in the working medium, the piston being coupled to an a.c. supplied linear actuator; the system formed by piston/armature coil assembly of the actuator and working medium resonates at a frequency which is tuned to the alternating current frequency.

Abstract: A refrigerator operable with an evaporation chamber and superfluid .sup.4 He II for temperatures below the .lambda.-point of helium, and means for preventing the .sup.4 He II from creeping upward out of the evaporation chamber.

Abstract: Apparatus for evaporating liquids, including means to form the liquid into a thin film on a heatable wall, the means comprising a porous layer having a first portion which covers the wall concerned and at the top of the wall passes via a bend into a second portion which is spaced from the first portion and is surrounded by a liquid-receptacle.

Abstract: A sorption pumping device characterized in that a space to be evacuated can be connected to the sorption material successively at at least two different levels of the device.

Abstract: A dry-shaver with a flexible foil shear plate and a reciprocating cutter, the cutter comprising a plurality of cutting elements each having a generally elliptic shape, the cutter being tiltable about an axis parallel to the direction of reciprocating movement, with a tendency of the cutter to tilt toward the point at which pressure is applied through the shear plate onto the cutter.

Abstract: A plasma-MIG welding method and device in which a stream of oxidizing gas, such as argon plus 2% oxygen, is introduced into the plasma arc in the region of the plasma nozzle orifice. This improves the stability of the MIG arc, and higher welding currents can be used, especially with negative polarity on the electrodes and the plasma and MIG arcs.

Abstract: A swash-plate transmission drive system including a rotary driven shaft, reciprocally movable drive shafts, a swash plate secured on said driven shaft, and sliding members, each having a flat surface engaging said plate and a spherical surface engaging one of said drive shafts.

Abstract: A detachable shaving head for a vibrator dry shaving apparatus including a cap, a thin shear plate with hair-entrance apertures disposed in the cap, and a cooperating cutter disposed on a pivotable carrying frame which can be latched in the cap. A single spring means urges the latch to lock and urges the cutter into engagement with the shear plate.

Abstract: A method of manufacturing a cross-flow plate-type heat exchanger in which I-shaped plates are assembled with end plates, and subjected to compression and a thermal treatment, whereby the plates are connected.

Abstract: Container for storing and transporting a liquefied gas provided with an auxiliary container which contains a material by which gas produced by evaporation of the liquid is sorbed at a temperature higher than the temperature of the liquid.

Abstract: A trimming unit with stationary and axially movable cutters, and a coupling member which drives the movable cutter, and helical springs disposed at either side of the coupling member for urging the cutters against each other, and for urging the movable cutter to return to its neutral position.

Abstract: An electric hair trimmer for use as a home appliance having cutters covered by a flap which in the closed condition resiliently presses against a movable trimming cutter, and in the open condition allows removal of the cutters for cleaning.

Abstract: An electric dry-shaving apparatus with cutters which, viewed in their direction of movement, are preceded by separate hair pulling members, which pull the hairs slightly up from the skin before these are shaved off.

Abstract: A heating device comprising a plurality of heating chambers, each chamber being bounded by the heat-transmission wall of a reservoir in which a heat-transmission wall of a reservoir in which a heat transport medium is present which completes an evaporation/condensation cycle. The reservoirs are connected, via a common reservoir which also contains heat transport medium, to the same common heat source.

Abstract: A dry-shaver having a reciprocating drive cutter that cooperates with a stationary counter-cutter, the latter being resiliently mounted on a stationary part of the dry-shaver housing and urged against the driven cutter.

Abstract: A seal assembly situated between two relatively rotatable members and axially separating a space of higher pressure from a space of lower pressure, the seal assembly including a fluid reservoir and a seal exposed to said high pressure and axially slidable to urge fluid from the reservoir into a sealing space when leakage occurs therefrom.