Top IPC subclasses
1
|
G06K
|
13
|
Recognition of data; presentation of data; record carriers; handling record carriers
|
2
|
B41M
|
3
|
printing, duplicating, marking, or copying processescolour printing
|
3
|
B23H
|
3
|
Working of metal by the action of a high concentration of electric current on a workpiece using an electrode which takes the place of a tool; such working combined with other forms of working of metal
|
4
|
G08G
|
1
|
traffic control systems
|