John Parry, who led by two overnight, was another stroke back in third.

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World number 177 John Parry holds a four-shot halfway lead at 12 under.

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John Parry led the field by two after a 71, with Ryder Cup man Martin Kaymer firing a 68 to share second spot.

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Jerrold Zacharias at the Massachusetts Institute of Technology developed a practical atomic clock around the same time that Louis Essen and John Parry established the first atomic clock at the National Physical Laboratory in Teddington, west of London.

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