DE686169C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Device for sealing the rotary drill rod against gas or oil outbreaks
Assignee: PREUSSISCHE BERGWERKS und HUET
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Filing: 1937-09-24
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Granted: 1940-01-04
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Expires: 1957-09-24
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-11-03 21:03
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; E21B33/085
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References Cited (Backward Citations)
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