Motors: Spring, Weight, Or Animal Powered Patents (Class 185)
Composite (Class 185/2)
Animal powered (Class 185/15)
Weight (Class 185/27)
Spring (Class 185/37)

Foreign Patent Art Collections

Class-related foreign documents (Class 185/FOR000)

Digests

Spring powered toys (Class 185/DIG1)
Foreign digest (Class 185/DIG2)