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Application filed by Michael George MitchellfiledCriticalMichael George Mitchell
Publication of AP8600034A0publicationCriticalpatent/AP8600034A0/en
The invention relates to an alarm unit for preventing theft of or inteference with articles. The unit comprises a portable box housing a battery powered electrical circuit which includes a vibratory switch and a sound emitting alarm. A key operated lockable switch also forms part of the circuit operates such that when the key operated switch is locked, closure of the vibratory switch will cause the sound emitting alarm to sound.
Bis expansion of patent n 524,308. Alarm systems and protection of possible live buried persons (Machine-translation by Google Translate, not legally binding)