MEJORAS A DISPOSITIVO PARA EL CONTROL DE LA POSICION DE UNA MAQUINA PARA AVANZAR GALERIAS

In apparatus for controlling the position of a drift advancing machine having a longitudinal axis: two light beam sources or laser beam sources spaced longitudinally from the machine, the sources emitting beams which are parallel to each other and to the drift axis and which are in different vertica...

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Bibliographische Detailangaben
Hauptverfasser:	BERNHARD DROSCHER, ALFRED ZITZ
Format:	Patent
Sprache:	spa
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES GYROSCOPIC INSTRUMENTS LARGE UNDERGROUND CHAMBERS MEASURING MEASURING DISTANCES, LEVELS OR BEARINGS MINING MINING OR QUARRYING NAVIGATION PHOTOGRAMMETRY OR VIDEOGRAMMETRY PHYSICS SHAFTS SURVEYING TESTING TUNNELS
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