| ReturnTo Theme-Group-Choice | Onelevelup |
| 3B117 | Prevention of fouling | |
| B08B15/00 -17/06 | ||
| B08B15/00-17/06 | AA | AA00 KINDS OF FOULING |
AA01 | AA02 | AA03 | AA05 | AA06 | AA08 | ||||
| . Dust | . Smoke or gas | . . Odors | . Rust or scales | . Living organisms | . Others | |||||||
| B08B15/00-15/04 | BA | BA00 MEANS FOR PREVENTINg DIRT FROM SPREADING |
BA01 | BA02 | ||||||||
| . Food | . . Stationary types | |||||||||||
| BA12 | BA13 | BA14 | BA15 | |||||||||
| . . Movable types | . . . Stand types | . . . Means that move up and down and left and right | . . . Rotary or free-arm types | |||||||||
| BA21 | BA22 | BA23 | ||||||||||
| . Rooms | . . Stationary types | . . Conveyor types | ||||||||||
| BA31 | BA32 | BA33 | ||||||||||
| . Screens or curtains | . . Drop curtains | . . . Accordian-fold drop curtains | ||||||||||
| BA42 | BA43 | BA44 | ||||||||||
| . . Fluid curtains | . . . Gases | . . . Liquids | ||||||||||
| BA51 | ||||||||||||
| . Others |