ECONO CHECK SYSTEM by WM. L. RIGGS COMPANY, INC. (Track this)
Intl: (001) Chemicals US: 026 Filing date: 18-Apr-1957 Serial number: 72033664
ECONO SOUR by ECOLAB USA INC. (Track this)
Intl: (003) Cosmetics and cleaning preparations US: 006 Filing date: 24-Feb-1945 Serial number: 71480169