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DE443299C
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Process for eliminating troublesome wall cavities u. Like. When using the rotary balance underground
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DE434259C
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Method for determining higher methane and carbonic acid content in mines
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DE443215C
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Process for eliminating troublesome wall cavities u. Like. When using the rotary balance underground
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DE448003C
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Apparatus for determining the change in the vertical component of the attraction force in the vertical direction
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DE398960C
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Device for detecting small quantities of mine gas on an electric mine lamp
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DE393644C
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Arrangement for determining the direction of an alternating or direct current flowing in the earth
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DE434460C
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Arrangement for searching for better and worse conductive deposits, e.g. B. Ores, salt, underground
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DE413284C
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Gravitational balance like those of Eoetvoes
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DE407495C
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Procedure for determining the approximation of water in cased boreholes
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DE369383C
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Method for determining the composition of flowing and static gas mixtures by changing the sound of electrical beats
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DE443164C
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Device for the simultaneous relative measurement of geomagnetic elements at two spatially separated field points
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DE373990C
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Device for collecting and examining the drilling air in bores
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DE377837C
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Method for determining the depth of an embedment in the earth that disturbs the streamlined field
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DE385787C
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Device for measuring angular deflections
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