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Meteorology
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humidity slide rule
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Blundell Harling Limited
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Blundell Rules Limited
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Blundell Rules Ltd
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Humidity slide rule Mk 6A by Blundell Harling Ltd of Weymouth
1972
Humidity slide rule Mk 6A by Blundell Harling Ltd of Weymouth
1972
Humidity slide rule Mk 6
1972