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An improved cooling arrangement for an electronic plug-in module assembly having a plurality of modules supported in grooves in a pair of parallel sides. Each parallel side is provided with fluid passageways for carrying a cooling liquid for removing heat transferred from a heat sink on each module

An improved cooling arrangement for an electronic plug-in module assembly having a plurality of modules supported in grooves in a pair of parallel sides. Each parallel side is provided with fluid passageways for carrying a cooling liquid for removing heat transferred from a heat sink on each module to the sides. A plurality of apertures are provided in each side between adjacent grooves and carry fins through which cool air is blown to cool each side of each plug-in module.

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A modular electronic system comprising, a support assembly having first and second side plates each having a plurality of spaced grooves therein, a plurality of electronic modules each having a metallic frame with the ends of each said metallic frame being slidably mounted in opposed grooves in said

A modular electronic system comprising, a support assembly having first and second side plates each having a plurality of spaced grooves therein, a plurality of electronic modules each having a metallic frame with the ends of each said metallic frame being slidably mounted in opposed grooves in said first and second side plates, a plurality of through slots in said first and second side plates, each said slot being positioned between adjacent grooves to provide air passages through said first and second side plates, means for circulating air through said plurality of slots thereby transferring heat from said electronic modules to said first and second side plates, a first longitudinal cooling passage in each said side plate positioned above said through slots and behind said spaced grooves and a second longitudinal cooling passage in each said side plate positioned below said through slots and behind said spaced grooves, and means for circulating cooling liquid through said passages.