counterbalanced horizontal access doors made of metal for sidewalks, floors, pits, ceilings, and roofs; and counterbalanced metal basement doors; metal safety posts and safety supports for use in connection with ladders, hatchways, hatchway doors, and accessways

'access':3 'accessway':36 'basement':18 'ceil':12 'connect':29 'counterbalanc':1,16 'door':4,19,34 'floor':10 'hatchway':32,33 'horizont':2 'ladder':31 'made':5 'metal':7,17,20 'pit':11 'post':22 'roof':14 'safeti':21,24 'sidewalk':9 'support':25 'use':27

BILCO

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