Nothing in sections 624.20 to 624.25 shall be construed to prohibit any resident wholesaler, dealer, or jobber, from possessing or selling at wholesale fireworks which are not prohibited; or the possession or sale of any kind of fireworks for shipment directly out of the state; or the possession or use of fireworks by airplanes and railroads, or other transportation agencies for signal purposes or illumination; or the possession, sale, or use of blank cartridges for a show or theater, or for signal or ceremonial purposes in athletics or sports, or for use by military organizations or for use as a bird or animal repelling device.