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Handbook for architects and builders (1898)
Illinois Society of Architects · Chicago · leaf 624
;%?t>^x C-Fig. 1.Wade Accessible flushing backwatervalve for prevention of floodedcellars. … C-Fig. 18.Floor drain and backwater valve.Architecture · Building · Architects
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
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