{TAIL ~ The invention} concerns a device for erecting walls and {HEAD ~ ceilings} especially for exhibition purposes as at fairs and to be used as exhibition pavilions, free standing structures, single or multi story lobby booths and the like 
{ TAIL ~ The invention } concerns a device for erecting walls and { HEAD ~ ceilings } especially for exhibition purposes as at fairs and to be used as exhibition pavilions , free standing structures , single or multi story lobby booths and the like
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