| 摘要 |
Arrangement of proximity switches with respect to a part of valves and fittings which is to be moved, for the purpose of signalling the position thereof, in which the part (1) of valves and fittings to be monitored has one or more imperfections (5, 6) which for the purpose of signalling a specific position of the part of the valves and fittings can be brought with said part into a position directly in front of a proximity switch (11, 12). <IMAGE>
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