| http://www.w3.org/ns/prov#value | - nected to the backrest connecting part 24 respectively and the other end is pivotally coupled to the front leg 30 respectively.As shown in FIGS. 4A and 4B, the baising device in this embodiment is a torsion spring 50 which has a hollow body portion 51 to allow a fastener, such as a rivet, passing therethrough and two arms 52 extending outward from either ends of the body portion 51 respectively.
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