nber category 6 Others subcat 68 Receptacles

uspto classes
53 Package Making
206 Special Receptacle or Package
215 Bottles and Jars
217 Wooden Receptacles
220 Receptacles
224 Package and Article Carriers
229 Envelopes, Wrappers, and Paperboard Boxes
232 Deposit and Collection Receptacles
383 Flexible Bags

Historic patent counts for subcat 68

uspto search in the 1790 to present database

ccl/53/$ OR ccl/206/$ OR ccl/215/$ OR ccl/217/$ OR ccl/220/$ OR ccl/224/$ OR ccl/229/$ OR ccl/232/$ OR ccl/383/$

Back to the NBER List