Folding Square
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A T-shaped or L-shaped instrument for drawing or testing right angles.
Galleries
Mechanical Drawing ToolsSource
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
Downloads
1919×2400, 289.9 KiB
818×1024, 41.5 KiB
511×640, 22.4 KiB
255×320, 8.4 KiB