I work for the company that was Ethyl and we have old "propaganda posters" touting the benefits of tetraethyllead on the walls of the administration building at the location where TEL was produced. They're curios from another time and hung on the walls as a reminder that acceptable science, norms, and requirements change over time. We're not the company we once were, but the past is worthy of remembrance--if only so the mistakes thereof are not repeated.