Patent classifications
A
HUMAN NECESSITIES
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A23
FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
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A23K
FODDER
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20/00
Accessory food factors for animal feeding-stuffs
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A23K20/20
Inorganic substances, e.g. oligoelements
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A23K20/22
Compounds of alkali metals
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