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Publication of LU38921A1publicationCriticalpatent/LU38921A1/xx
F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
F28F21/088—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal for domestic or space-heating systems
A—HUMAN NECESSITIES
A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
A47H—FURNISHINGS FOR WINDOWS OR DOORS
A47H13/00—Fastening curtains on curtain rods or rails