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Round 110mm diameter protractor with 0-360 scale on outside edge. Centre drilled for location and gridded in squares each of 3 nm 1:500,000 with centre horizontal 1:500,000 scale.
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Round 110mm diameter protractor with 0-360 scale on outside edge. Centre drilled for location and gridded in squares each of 3 nm 1:500,000 with centre horizontal 1:500,000 scale.
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