Antiques (US) 
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$172.50
Antique Kelvin Hughes 24" Brass Parallel Ruler Nautical Navigation Tool in Box
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$49.99
Vintage Kelvin & Hughes Hinged Parallel Nautical Brass Ruler Made Great Britain
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$66.92
Antique Navigation Parallel Rule Stanley London British Made small 6.25 inches
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$16.89
RARE EBONY KELVIN, BOTTOMLY & BAIRD "CAPTAIN FIELD’S IMPROVED" PARALLEL RULER
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$122.07
Brass Rolling Ruler, U.W.W. Makers Birmingham, Navigation, Engineering, 18" L
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$299.99
Antique Kelvin & Hughes 24" Brass Parallel Ruler Nautical Navigation Tool in Box
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$38.99
Vintage Maclean Parallel Lucite Ruler 21" Perspex
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$175.00
NEGUS Antique Parallel Ruler In Box
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$149.00
Paralel ruler in wooden box vintage with wooden handle and brass rollers
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$425.00
Rare vintage E.R.WATTS & SON Parallel Rules London year 1943 (WWII).
