The inspecting organization shall stamp the qualification mark (annex 7) on the specification of Derrick cranes for the derrick cranes qualified in the completion test or deemed qualified according to Paragraph 3 of Article 34, after being signed by the labor inspector or acting inspector (hereinafter referred to as the Inspector), one (1) copy of the specification shall then be delivered to the applicant. The qualification mark shall be printed, painted or posted at distinct portion of the crane for easy identification.The inspecting organization shall issue the Report for Results of Completion Inspection (Annex 20) and Qualification Certificate (Annex 9) to derrick cranes qualified in the completion inspection, the maximum period of validity ofr the aforesaid documents shall be two (2) years.The employer shall hang the aforesaid Qualification Certificate or its photocopy in the cab of the cranes or obvious locations in the workplace.