Posting of certificates.
Section 40
SEC. 40. Posting of certificates. — The owner, manager or other person in charge of any mechanical works, project or plant of twenty horsepower or more, of a firm, co-partnership, corporation, or joint-stock association shall post or cause to be posted in a conspicuous place within such plant or other place of business, the certificate of registration of the engineer or engineers and of the certified plant mechanic or mechanics employed in such plant, in a frame protected by transparent glass or its equivalent.