Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01H
ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
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33/00
High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
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H01H33/53
Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
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H01H33/563
comprising means for monitoring the density of the insulating gas
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