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schematic symbol: miscellaneous - double spark gapEN 60617: 07-22-02
schematic symbol: miscellaneous - spark gapEN 60617: 07-22-01
schematic symbol: miscellaneous - faultEN 60617: 02-17-01
schematic symbol: miscellaneous - flashover, break-throughEN 60617: 02-17-02
schematic symbol: miscellaneous - permanent magnetEN 60617: 02-17-03
schematic symbol: miscellaneous - touch sensorEN 60617: 07-19-04
schematic symbol: miscellaneous - proximity sensorEN 60617: 07-19-01