Section 15. Restrictions on sale by manufacturer and dealers.

(1) No manufacturer or dealer shall sell or offer for sale or otherwise dispose off, to any person bricks for a price or at a rate exceeding the maximum fixed under section 13. (2) Where bricks are sold, offered for sale or otherwise disposed off in contravention of sub-section (1), by a manufacturer or dealer or through any person employed by him or acting on his behalf, such person and also unless they prove that they exercised due diligence to prevent such contravention, the manufacturer or dealer, as the case may be, and any person having the charge on behalf of the manufacturer or dealer of the place where such contravention occurred, shall be liable to punishment provided by section 21, whether or not they were present when the contravention occurred.