Hand-operated mechanical device and system consisting primarily of constant force and/or backwound springs contained within an injected molded plastic housing used for raising and lowering in-store signs, primarily for the purpose of changing and cleaning of signs

'and/or':13 'backwound':14 'chang':37 'clean':39 'consist':8 'constant':11 'contain':16 'devic':5 'forc':12 'hand':2 'hand-oper':1 'hous':22 'in-stor':28 'inject':19 'lower':27 'mechan':4 'mold':20 'oper':3 'plastic':21 'primarili':9,32 'purpos':35 'rais':25 'sign':31,41 'spring':15 'store':30 'system':7 'use':23 'within':17

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