The contractor shall in respect of all persons employed by him"(whether in execution of the contract or otherwise) in every factory, workshop or place occupied or used by him for the execution of the contract comply with the 'conditions required by this Resolution. Before a
Contractor is placed upon a department's list of firms to invited to tender, the department shall obtain from him an assurance that to the best of his knowledge and belief he has complied with the general conditons required by this Resolution for at least the previous three months.