Upon making application for a messenger and/or learner certificate or for renewal thereof, an employer shall post a copy of the first page of the completed application form in a conspicuous place in each department of the plant or establishment where he/she proposes to employ messengers and/or learners at subminimum wage rates. Such notice shall remain posted until the application is acted upon by the Administrator. (The information collection requirements contained in paragraphs (a), (b) and (c) were approved by the Office of Management and Budget under control number 1215-0192.)