| 摘要 |
The present invention relates to a device having a push button-type mechanism and also relates to methods for using such devices. The push button-type mechanism to be used has at least two variable positions that can be changed by the user to mark the occurrence of an event. The device is useful for teaching or learning as well as for meeting non-educational needs such as filling household grocery lists, recipes, miscellaneous lists, and work status sheets in the manufacturing and service industries. The device may be contained on pages of a book and/or cards and/or a plate.
|
