Abstract: A storage shelf assembly has a plurality of shelves, each shelf being of one-piece, integrally molded, plastic construction, and having a socket at an end thereof for positioning adjacent a socket of a shelf of a like storage assembly with said assemblies positioned in end-to-end relationship. The shelves are supported in horizontal, parallel, vertically spaced relation. A coupler is provided for coupling the like assemblies together in said end-to-end relationship. The coupler is of one-piece, integrally molded, plastic construction, and has spaced members adapted for insertion in the sockets, the spaced members of the coupler being maintained in fixed spaced relationship.

Abstract: A blow molded storage container which is at least 20 inches wide and thirty inches long. The container is blown through an end wall with at least two blow bins. Also the rear section of the door rim is at least twice the width of the front section.

Abstract: A container which is a combination tool box/organizer. The organizer section comprises at least two shelves with at least two bins per shelf. The shelves have protector covers which can be locked when in a closed position.

Abstract: A plastic janitorial x-frame cart which is stable when in the closed position. The cart contains a circular rotator which allows the unit to take advantage of the symmetry of legs. Further the unit contains a bottom tray with elevated ends.

Abstract: An oxygen sensor is described which includes an electrochemical cell having a gas diffusion electrode which includes a porous metal layer and another layer substantially non-porous to the electrolyte but porous to oxygen, interposed between the porous metal layer and the environment of the sensor as the cathode or working electrode, a salt electrolyte capable of being molten at the temperature of operation of the sensor, a counter electrode as anode, a reference electrode, means for maintaining the working electrode at a constant potential with reference to the reference electrode, and means for determining the current flowing in the cell due to the reduction of oxygen present in the environment of the cell at the gas diffusion electrode and characteristic of the amount of oxygen present, the oxygen sensor including a noble metal and noble metal/noble metal oxide electrode as the counter electrode and the reference electrode respectively. Platinum is the preferred noble metal.

Abstract: Ion-sensitive electrodes are described for determining the concentration of cations of a predetermined type in electrolytes. In one such electrode a material with a high ionic mobility such as a .beta. alumina may be used to protect material, such as a mercury amalgam, which allows interactions requiring the supply of electrons and the cations to take place internally, both materials containing cations of the predetermined type.

Abstract: Ion-sensitive electrodes are described for determining the concentration of cations of a predetermined type in electrolytes. One such electrode includes non-stoichiometric material, such as tungsten bronze, containing cations of the predetermined type. Where an electrolyte may attack tungsten bronze of a .beta. alumina, also containing cations of the predetermined type, may be positioned between the tungsten bronze and the electrolyte. In another electrode a material with a high ionic mobility such as a .beta. alumina may be used to protect material, such as a mercury amalgam, which allows interactions requiring the supply of electrons and the cations to take place internally, both materials containing cations of the predetermined type.