{HEAD ~ The invention} concerns {TAIL ~ a device} for erecting walls and 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 
concerns
{ HEAD ~ The invention } concerns { TAIL ~ a device } for erecting walls and 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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