| http://www.w3.org/ns/prov#value | - Thebracket 53 (sce Figure 5) comprises a flat plate 54 for attachment to a wall or other suitable surface, said plate 54. having. a pair ofiinwardly. opening converging. side channels 5 5: for engaging lat-v erally projecting ribs 56 provided on opposite exterior faces of the housing l2 of. body- I. The, plate 54- is providedwitha number-- of holes 51 to. receive counter-sunk fixing screws 58; ani
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