How do i attach a sheet of melamine to wall without seeing screws??

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attached picture shows a piece of 32mm melamine board attached to a brick wall, I cannot find out how its attached, I cannot budge it, its solidly attached somehow. I cannot see any screws or brackets or anything.
anyone know how it would be attached??
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http://www.renovateforum.com/images/attach/jpg.gif DSC_0756_.jpg (http://www.renovateforum.com/attachments/f85/111740d1459496295-how-do-i-attach-sheet-melamine-wall-without-seeing-screws-dsc_0756_.jpg) (261.5 KB)




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