NBER Categories

Historic patent counts for subcat 41

uspto search in the 1790 to present database

ccl/174/$ OR ccl/200/$ OR ccl/327/$ OR ccl/329/$ OR ccl/330/$ OR ccl/331/$ OR ccl/332/$ OR ccl/334/$ OR ccl/335/$ OR ccl/336/$ OR ccl/337/$ OR ccl/338/$ OR ccl/392/$ OR ccl/439/$

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