Certification Number : ATC-CAL-VFP-7216
Date of Calibration: January 17, 2026
Test Due Date : January 16, 2027
Company : Daqing Oilfield Construction Group Co., Ltd.
VARIABLE FREQUENCY SERIES RESONANCE SYSTEM CALIBRATION CERTIFICATE (7216)
Certification Number : ATC-CAL-VFP-7216
Date of Calibration: January 17, 2026
Test Due Date : January 16, 2027
Company : Daqing Oilfield Construction Group Co., Ltd.