Top IPC subclasses
1
|
C04B
|
2
|
Lime; magnesia; slag; cements; compositions thereof, e.g. mortars, concrete or like building materials; artificial stone; ceramics; refractories; treatment of natural stone
|
2
|
C01G
|
1
|
Compounds containing metals not covered by subclasses C01D or C01F
|
3
|
G01N
|
1
|
Investigating or analysing materials by determining their chemical or physical properties
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