Description: 84 / (2) String Instruments (3) Struck (Pianos, Dulcimers and Clavichord) (4) Travelling Sheet (Player Pianos) (11) Pneumatic Hammer Action

Hierarchy/Derived subclasses

84 / 2	-> 3	-> 4	-> 11	-> 12
				-> 13

CIPO searches

search just 84/11

- or -

search hierarchy!

The "search hierarchy!" link will execute this search:
((84/11 <IN> CPC) <OR> (84/12 <IN> CPC) <OR> (84/13 <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.

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