| http://www.w3.org/ns/prov#value | - top slit, said casing being mounted securely in said mounting seat below and between said frontand rear top beams, said locking member including a button adapted to be mounted on the exterior of the first housing, a guide plate that extends from said button through said front and rear top slits, and a pressing shaft that extends from said buttonand that has a free end which defines said engaging e
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