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Size 6-1/4'' X 9-7/8''
1/16 to 2-1/2 axes.
All are 35° - 16\' projection.
Dimensions are for isometric axes. Half of the 2-1/2 ellipse is surrounded with pinholes spaced at every 15 isometric degrees.
Lifetime precision centering pinholes are provided for major, minor and isometric axes.
