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Class Information
Number: 116/151
Name: Signals and indicators > Bells > Pneumatic actuation
Description: Bells in which pneumatic means are used for moving the bell or controlling its motion.

Patents under this class:

Patent Number Title Of Patent Date Issued
7640883 Fluid-operated communication system Jan. 5, 2010
4275681 System gas alarm Jun. 30, 1981
4269878 Stand structure May. 26, 1981

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