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Denbighshire
and at the moment there are no bubbles
defensive positions
The altimeter is in very good condition
Aston & Mander Air Ministry Parallel Ruler Bleuler London DenbighshireA WW2 RAF Air MInistry parallel ruler. Marked 'Captain Field's Improved Parallel', it would have been used by RAF naviagtors and aircrew. It was made by Aston & Mander of London, who supplied navigational and other instruments to the British armed forces in both world wars. Captain Field's Improved Parallel Rule: The parallel ruler was invented around 1584 by Fabrizio Mordente, but it was not in common use until the 18th century. In the 19th century,
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