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| Number | Title | Issue Date |
| 7091829 | System and method for informing a critical situation by using network The present invention relates to system and method for informing a critical situation by using network, to ask for help about present danger to Crime Prevention Center. When a user is facing a dangerous person, the user inputs images or a voice of the dangerous pers... | 08/15/2006 |
| 4321587 | Display unit with a removable indicator panel A display unit includes a casing formed with an opening and a removable panel adopted to be mounted in the opening. The casing has a groove formed in a portion of the edge defining the opening. The removable panel has a projection extending outwards from ... | 03/23/1982 |
