nber category 1 Chemical subcat 12 Coating

uspto classes
106 Compositions: Coating or Plastic
118 Coating Apparatus
401 Coating Implements with Material Supply
427 Coating Processes

Historic patent counts for subcat 12

uspto search in the 1790 to present database

ccl/106/$ OR ccl/118/$ OR ccl/401/$ OR ccl/427/$

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