FR722241A
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Annular support frame for mine galleries
Assignee: Fried Krupp AG
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Filing: 1931-09-01
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Granted: 1932-03-14
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Expires: 1951-09-01
Abstract
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Inventors
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Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-03 22:11
CPC Classifications
E; E21; E21D; E21D11/00; E21D11/14; E21D11/18; E21D11/22
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