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Creation Date 

1. Before 1982  (37)
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1. Human Necessities  (52)
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8. Nitrogenous Fertilisers  (37)
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11. Fertilisers Producing Carbon Dioxide  (31)
12. Inorganic Fertilisers Not Covered By Subclasses C05b, C05c  (31)
13. Pest Repellants Or Attractants  (30)
14. Biocides, E.G. As Disinfectants, As Pesticides, As Herbicides  (30)
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