Top IPC subclasses
1
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G01N
|
4
|
Investigating or analysing materials by determining their chemical or physical properties
|
2
|
G09B
|
3
|
educational or demonstration appliancesappliances for teaching, or communicating with, the blind, de
|
3
|
A61B
|
1
|
Diagnosis; surgery; identification
|
4
|
A61K
|
1
|
Preparations for medical, dental, or toilet purposes
|