official taxpayer identification number www.ssa.gov Social Security Administration's web site official taxpayer identification number this page www.ssa.gov Executive Order 9397 Security Number Chronology Social Security Number Chronology очень много изменений hijacked and subsumed into multiple other uses http://www.ssa.gov/history/ssn/ssnchron.html Short history of the SSN hijacked and subsumed into multiple other uses Social Security Number Chronology http://www.ssa.gov/history/ssn/ssnchron.html Social Security Administration