PTO means Patent and Trademark Office U.S. Department of Commerce in FDA
Similar to PTO
ACTB (NCTR) - Analytical Chemical Techniques Branch NCTRACTH - AdrenoCorticoTropic Hormone
ACTIS - Aids Clinical Trials Information Service
ACUS - Administrative Conference of the United States
ACWA - Administrative Careers With America
AD - Action Due
ad lib - as much as needed
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