Rectangular Military Protractor
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The rectangular protractor used to measure angles by the military.
Galleries
ProtractorsSource
Chief of Engineers Advance Map and Aerial Photograph Reading (Washington, DC: United States Government Printing Office, 1941)
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2400×729, 290.6 KiB
1024×311, 55.2 KiB
640×194, 30.1 KiB
320×97, 10.8 KiB