Patent DE833335C successfully refreshed from Google Patents.
DE833335C
Expired / Lapsed
DE
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Device for determining the drilling direction of rock boreholes during operation
Assignee: DEILMANN C BERGBAU GmbH
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Filing: 1950-09-20
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Granted: 1952-03-06
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Expires: 1970-09-20
Abstract
No abstract record available.
Inventors
- 👤 Dr-Ing Carl-Hans Biedendieck
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-08 07:00
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06; E21B7/068
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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