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E21D 15/54

Details of the ends of props (for permitting step-by-step movement E21D23/06)

Full Title

Props (in the building art E04G25/00); Chocks > Component parts or details of props (E21D15/43, E21D15/58, E21D15/60 take precedence) > Details of the ends of props (for permitting step-by-step movement E21D23/06)

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