| More topics under "B01 - Physical or chemical processes or apparatus in general" (1,362,943) |
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| B01B - Boiling; Boiling apparatus (1,326) |
| B01D - Separation (591,184) |
| B01F - Mixing, e.g. dissolving, emulsifying, dispersing (150,026) |
| B01J - Chemical or physical processes, e.g. catalysis, colloid chemistry; Their relevant apparatus (549,128) |
| B01L - Chemical or physical laboratory apparatus for general use (71,279) |