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Portland Time Speed and Distance Calculator – Sharp and Enright
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TIME - SPEED - DISTANCE - VINTAGE CALCULATOR - Large 150mm 6” BOAT NAVIGATION | eBay
Navigator Light Software
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Portland Speed Time Distance Calculator (Small) only £8.39
Speed Time Distance Slide Rule NATO Pattern
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Speed Time Distance (STD) Calculator/Slide Rule – The Navigation Centre, Townsville - Est 1970
