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2. Roof tiles - Wikipedia

   en.wikipedia.org/wiki/Roof_tiles

   The Conosera tile was developed by George Herman Babcock in 1889, and was unique due to its diagonally interlocking structure and design allowing for more installation flexibility than other interlocking tile designs. Babcock designed the pattern with towers and spires in mind, since his design significantly reduced the number of graduated tile ...

3. Marston Mat - Wikipedia

   en.wikipedia.org/wiki/Marston_mat

   RAF aircrew with one of their Bristol Beaufighters on a PSP airstrip at Biferno, Italy, August 1944. Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and ...

4. Twelve Steps and Twelve Traditions - Wikipedia

   en.wikipedia.org/wiki/Twelve_Steps_and_Twelve...

   Twelve Steps and Twelve Traditions is a 1953 book, which explains the 24 basic principles of Alcoholics Anonymous and their application. [1] The book dedicates a chapter to each step and each tradition, providing a detailed interpretation of these principles for personal recovery and the organization of the group. [2]