NBER Categories

Historic patent counts for subcat 14

uspto search in the 1790 to present database

ccl/534/$ OR ccl/536/$ OR ccl/540/$ OR ccl/544/$ OR ccl/546/$ OR ccl/548/$ OR ccl/549/$ OR ccl/552/$ OR ccl/554/$ OR ccl/556/$ OR ccl/558/$ OR ccl/560/$ OR ccl/562/$ OR ccl/564/$ OR ccl/568/$ OR ccl/570/$

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