https://www.uspto.gov/web/patents/classification/cpc/html/defB44C.html
CPC Definition - B44C PRODUCING DECORATIVE EFFECTS (processes for applying liquids or other flue...
https://www.uspto.gov/web/patents/classification/cpc/html/conB44Ctoipc.html
CPC to IPC Concordance - B44C
cpcipcconcordance