| 摘要 |
The present invention relates to a method and device for interpreting measurements made on working rams in longwall face working in underground mines, with a measurement station determining the extended length of the pushing ram or of its piston and giving, by addition, the mining advance. This device is characterised in that a pressure sensor 11 and preferably two pressure sensors 11, 14 are associated with the measurement station 10, these pressure sensors being adjusted to switch the measurement station on or off. <IMAGE>
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