The Wayback Machine - https://web.archive.org/web/20160428004627/http://patents.justia.com/patents-by-us-classification/4

Baths, Closets, Sinks, And Spittoons Patents (Class 4)


Cross-Reference Art Collections

Decontamination shower (Class 4/900)

Foreign Patent Art Collections

Class-related foreign documents (Class 4/FOR000)