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Manufacturer: STAEDTLER
6" tinted transparent plastic with beveled edges, 1/2 degree graduations and open center. 180 degree.
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Manufacturer: CLI
Open center clear plastic protractor has sharply defined graduations and a 6" ruler edge.
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Manufacturer: SAFE-T
Two protractors in one. Slotted separation eliminates confusion of supplementary angles. Lower scale reads right-opening angles and upper scale reads left-opening angles . Ruler scales are 6" and 10cm. Orange.
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