§ 6806.
Every person engaged in any business, avocation, or employment, who is thereby made liable to a special tax (other than a special tax under subchapter B of chapter 35, under subchapter B of chapter 36, or under subtitle E) shall place and keep conspicuously in his establishment or place of business all stamps denoting payment of such special tax.
([Aug. 16, 1954, ch. 736], [68A Stat. 831]; [Pub. L. 89–44, title VI, § 601(e)], June 21, 1965, [79 Stat. 155]; [Pub. L. 90–618, title II, § 204], Oct. 22, 1968, [82 Stat. 1235].)