Description: 325 / (15) Transmitter-Receiver Station (21) With One or More Common Stages
Hierarchy/Derived subclasses
CIPO searches
search just 325/21- or -
search hierarchy!
The "search hierarchy!" link will execute this search:
((325/21 <IN> CPC) <OR> (325/22 <IN> CPC))
This will show what classes derive from the input. Ex: entering 78/35 shows the derived classes and the search that can be used to find
patents in those subclasses.