categories & grades of qualification:
1st grade of general construction contracting for municipal public works
1st grade of general construction contracting for electro-mechanical works
1st grade of professional contracting for ground and foundation works
1st grade of professional contracting for electronic and intelligent works
1st grade of professional contracting for steel structure works
1st grade of professional contracting for building decoration & finishing works
1st grade of professional contracting for curtain wall works
1st grade of professional contracting for ancient building works
1st grade of professional contracting for environment protection works
2nd grade of general construction contracting for ports & waterway works
2nd grade of general construction contracting for water conservancy and hydro-power works
2nd grade of general construction contracting for electric power works
2nd grade of general construction contracting for mine works
2nd grade of general construction contracting for metallurgy works
2nd grade of general construction contracting for petrochemical works
2nd grade of general construction contracting for communication works
2nd grade of professional contracting for firefighting facilities works
issued by: special seal for administrative approval of department of housing and urban & rural development of anhui province