| 摘要 |
The invention relates to a filter device, especially a line filter forming part of hydraulic installations, said filter device comprising a filter housing (1) that can be removed from a filter head and is used to receive a filter element (5) that separates a non-filtered side (13) from a filtered side (11) in a position in the filter housing for the operation of the filter. According to the invention, the filter device is provided with a display device (19, 21) signalling the absence or presence of the filter element (5) in the filter housing (1) in the operating position.
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