Bi Rola Rule P.R. 500 Rolling Plotter [CPL220]

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The P.R. 500 has a considerably larger body than the smaller bi-rola rule. Built to take the rigorous use aboard commercial and blue-water vessels, the P.R. 500 provides one of the easiest methods invented for plotting courses. Dimensions: 19-5/8 in x 3-5/8 in x 1-1/4 in.