1 52.222-48 52.222-50 52.219-33 EXEMPTION FROM APPLICATION OF THE SERVICE CONTRACT LABOR STANDARDS TO CONTRACTS FOR MAINTENANCE, CALIBRATION, OR REPAIR OF CERTAIN EQUIPMENT - REQUIREMENTS (MAY 2014) LIMITATIONS ON SUBCONTRACTING (MAR 2020) TRADE AGREEMENTS (OCT 2019) CONVICT LABOR (JUN 2003) CONTRACTOR PERSONNEL IN A DESIGNATED OPE