It shall be unlawful for any person (a) with intent to deceive or defraud, to make, receive, use, or have in his possession any simulate or counterfeit practical form or copy of any standard or part thereof established under this chapter; or (b) without the written authority of the Secretary of Agriculture, to make, alter, tamper with, or in any respect change any practical form or copy of any standard established under this chapter; or (c) to display or use any such practical form or copy after the Secretary of Agriculture shall have caused it to be condemned.