| 摘要 |
FIELD: light industry. SUBSTANCE: device has a seal and/or a stamp whose bases are provided with information fields. The characters of at least one of the information fields are allowed to be changeable. In addition, the device has a coding unit which change the substance structure of the permanent and changeable characters and a unit for changing characters in time and/or in space in the information field of the base. The changeable characters are made for permitting the above mentioned units to change characters in time and in space. EFFECT: enhanced security and protection against falsification. 3 dwg |
