| • | Aircraft travel by employees in connection with the business of the employer, other than members of the flying crew. |
| • | Commissaries and restaurants for the employers' employees. However, such operations, when operated in connection with construction, erection, lumbering, or mining, will be assigned classification 3905 - restaurants. |
| • | Manufacture of containers, such as bags, barrels, bottles, boxes, cans, cartons, wooden pallets, or packing cases by employees of the employers for use in the employer's operations. |
| • | Hospitals, medical facilities, or dispensaries operated by employers for their employees. |
| • | Printing, lithography, or similar operations of the employer when used exclusively for their own products or needs. |
| • | Maintenance or ordinary repair of the employer's building or equipment when performed by employees of the employer. |
| • | Pick up and delivery when performed by employees of the employer in connection with the business of the employer. |
| • | Sales of all products being manufactured by the employer. |
| • | Warehousing, handling, packing, and shipping when performed by employees of the employer in connection with the business of the employer. |
| • | Testing or analytical laboratories when operated by employees of the employer in connection with the business of the employer. |