The signs or devices identifying the firm at each business location as required pursuant to Vehicle Code Section 11514 shall be of a permanent nature, erected on the exterior of the office or the dismantling area, and constructed or painted so as to withstand reasonable climatic effects. A temporary sign or device may suffice during the period of time required to obtain a permanent sign or device, providing the order for construction, purchase or painting has in fact been placed at time of submitting the application to the department.