F22B23/00—Water-tube boilers built-up from sets of spaced double-walled water tubes of return type in unilateral abutting connection with a boiler drum or with a header box, i.e. built-up from Field water tubes comprising an inner tube arranged within an outer unilaterally-closed tube
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Heat-Exchange Devices With Radiators And Conduit Assemblies
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Ensemble d'un disque de turbine d'un moteur a turbine a gaz et d'un tourillon support de palier, circuit de refroidissement d'un disque de turbine d'un tel ensemble