Folding Square
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This folding square is also known as a t-square which is a technical instrument, primarily a guide for drawing horizontal lines on a drafting table.
Galleries
Mechanical Drawing ToolsSource
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
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1024×578, 41.5 KiB
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320×180, 7.4 KiB