Abstract: A refrigerated display cabinet interior shelf system has one piece standards for shelf support. The standards are manually removeable from slotted brackets fixed to mullions in a cabinet structure. The standards have surfaces fully exposed to the cabinet interior. Each standard can maintain two shelf supporting clips on opposite sides at the same vertical dimension. The shelf system is manually disassembleable, and when assembled effectively eliminates protruding threaded fastener elements and multiple components in the shelf support system.

Abstract: An automatic background and contrast control unit is used in a facsimile transmitter or receiver unit and operates on the uncorrected video signal representing the shade of source document areas being scanned to produce a corrected output signal which accurately and uniformly represents the full range of black and white and intermediate grey areas of the document. The facsimile transmitter makes a preliminary calibrating scan in which it sequentially scans a known black area and a known white area, and the automatic background and contrast control unit fully automatically stores a first sample of the uncorrected video signal when the known black area is being scanned and stores a second sample of the uncorrected video signal when the known white area is being scanned.