nber category 6 Others subcat 62 Amusement Devices

uspto classes
273 Amusement Devices: Games
446 Amusement Devices: Toys
463 Amusement Devices: Games
472 Amusement Devices
473 Games Using Tangible Projectile

Historic patent counts for subcat 62

uspto search in the 1790 to present database

ccl/273/$ OR ccl/446/$ OR ccl/463/$ OR ccl/472/$ OR ccl/473/$

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