DIFF Subgroup
A47C 23/053 Attachment or interconnection of springs in frames or in spring units
Introduced: July 1974
Full Title
Spring mattresses with rigid frame or forming part of the bedstead, e.g. box springs; Divan bases; Slatted bed bases > using springs in compression, e.g. coiled > Frames therefor; Connecting the springs to the frame > Attachment or interconnection of springs in frames or in spring units