Books, Strips, And Leaves Patents (Class 281)
Strips and leaves (Class 281/2)
Book and leaf (Class 281/3.1)
Strips (Class 281/5)
Book, element thereof, or accessory therefor (Class 281/15.1)
Book or leaf holder (Class 281/45)
Miscellaneous (Class 281/51)

Foreign Patent Art Collections

Class-related foreign documents (Class 281/FOR000)

Digests

Magnet (Class 281/DIG1)