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Class Information
Number: 200/DIG.20
Name: Electricity: circuit makers and breakers > Sound and vibration operated

Patents under this class:

Patent Number Title Of Patent Date Issued
6459379 Earthquake-alarm device Oct. 1, 2002
5742235 Vertical, unidirectional seismic switch Apr. 21, 1998
H891 Automatic illumination switching device Feb. 5, 1991
4690242 Sound actuated switch Sep. 1, 1987
4528559 Seismic actuation system Jul. 9, 1985
4408196 Seismic alarm system Oct. 4, 1983
4011418 Vibration responsive switch Mar. 8, 1977
3938123 Driver alert device Feb. 10, 1976

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