Reinforced-concrete doors : no. 1, a door with T iron rim and expanded metal and flat iron reinforcement filled in with concrete and hung on runners and made to slide, fixed on the outside of an opening : no. 2, a door with T iron rim and expanded metal and flat iron reinforcement filled in with concrete, hung on runners and made to slide, fixed on the inside of an opening : no. 3, a set of two doors as above described, placed opposite to one another, 14 ins. apart, one on the outside and one on the inside of an opening : constructed for experimental purposes to the design of Commandant Welsch : particulars of experimental fire tests

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Title: "Reinforced-concrete doors : no. 1, a door with T iron rim and expanded metal and flat iron reinforcement filled in with concrete and hung on runners and made to slide, fixed on the outside of an opening : no. 2, a door with T iron rim and expanded metal and flat iron reinforcement filled in with concrete, hung on runners and made to slide, fixed on the inside of an opening : no. 3, a set of two doors as above described, placed opposite to one another, 14 ins. apart, one on the outside and one on the inside of an opening : constructed for experimental purposes to the design of Commandant Welsch : particulars of experimental fire tests"

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