| http://www.w3.org/ns/prov#value | - A securing means, such as a screw 46, is provided for securing the frame 42 to the fitting 38.In order to prevent unintentional loosening of the screw 46, a plurality of receptacles 50, as shown in FIGS. 2c and 2e, are preferably provided on top of the screw 46.
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