pitch of corrugations

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Corrugated galvanised iron — roofing in Mount Lawley, Western Australia … Wikipedia
Roof — A roof is the covering on the uppermost part of a building. A roof protects the building and its contents from the effects of weather. Structures that require roofs range from a letter box to a cathedral or stadium, dwellings being the most… … Wikipedia
Roof construction — This article is about house construction that consists of beams and an outer weatherproof skin, as found on most domestic architecture. Such roofs may take a number of different shapes. Construction of a ridged roofA simple ridged roof consists… … Wikipedia
Tupolev TB-3 — infobox Aircraft name =TB 3 (ANT 6) type =Heavy bomber manufacturer =Tupolev caption =TB 3 4M 17F designer =Andrei Tupolev first flight =22 December 1930 introduction =1932 retired =1939 Soviet Air Force (officially) 1945 Soviet Air Force ( de… … Wikipedia
Heat exchanger — An interchangeable plate heat exchanger Tubular heat exchan … Wikipedia
Shibe Park — Connie Mack Stadium Former names Shibe Park (1909 1953) Connie Mack Stadium (1953 1976) Location N 21st St W Lehigh Ave, Philadelphia, PA … Wikipedia

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