US PATENT SUBCLASS 71 / 32
.~.~ Phosphorus-containing

Current as of: June, 1999
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71 /   HD   CHEMISTRY: FERTILIZERS

1  DF  PROCESSES AND PRODUCTS {5}
31  DF  .~ Inorganic material {5}
32.~.~ Phosphorus-containing {1}
33  DF  .~.~.~> Phosphates {6}

DEFINITION

Classification: 71/32

(under subclass 31) Methods and products in which the fertilizer contains P.