user: Question: What is the sector of the company with an incorporated date before 1983?
Columns: ['S.No', 'Company', 'Incorporated', 'Ministry', 'Sector']
Types: ['real', 'text', 'real', 'text', 'text']
Sample row: [1.0, 'Air India Air Transport Services Ltd.', 2003.0, 'Ministry Of Civil Aviation', 'Services']
SQL:

assistant: SELECT "Sector" FROM "Table" WHERE "Incorporated" < 1983.0;