| 摘要 |
<p>The marking system is intended for use with returnable containers such as crates, boxes, cases, dishes, etc., used for food and drink, or other consumable products. A conventional bar code is printed on the outside of the container. The novel feature is that the bar code can be washed off and renewed by the packing station after return. The bar code may also be printed in an ink which is only visible under ultra-violet or infra-red light. This facility may be needed for aesthetic or security reasons. @(6pp Dwg.No.0/0).</p> |
