precleaning

n.

预洗涤，预清洗；预清洁；

Marks published for opposition
FM 10-52-1 Chptr 4 Purification Operations
Device for cleaning and closing print cartridges and closing element for closing print cartridges
Pneumatic device for cleaning air filters
Use of transition metal complexes as bleach catalysts in washing and cleaning agents
Process for cleaning a cold trap
10 Best Practices for Spring Cleaning Your Data Center
CLEANING HOUSE
DIVERSE SCREENS WITH CLEANING AND DISTRIBUTION MEANS
Process for consolidating particulate solids and cleaning products therefrom II