Offences by Corporation or local authority

If an industrial concern or a local authority contravenes any provision of this Act or rule made thereunder, then in the case of the industrial concern, every director, manager, secretary, or other officer or agent thereof and in the case of a local authority, the Chief Executive Officer and the Engineer-in-charge in the employ of such local authority shall, unless he proves that the contravention took place without his knowledge or that he exercised all due diligence to prevent such contravention, be deemed to be guilty of such contravention.