Fireworks may be shipped, delivered or sold for delivery to points outside this City where the sale or use thereof is lawful, by any wholesaler, retailer, jobber, warehousemen, or a manufacturer, or manufactured for such sale or distribution only, or kept in storage in a safe and secure place pending the lawful disposal thereof; but no fireworks shall be handled, manufactured or stored as set forth herein without the express written approval of the Chief. Such approval shall be revocable for cause and shall be granted only upon application therefor, setting forth a description of the place of storage or manufacture and such other information as the Chief shall require.