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FR981860A
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Method and apparatus for continuous coal mining
Assignee: SUNNYHILL COAL Co
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Filing: 1949-02-28
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Granted: 1951-05-30
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Expires: 1969-02-28
Abstract
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Inventors
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Bibliographic Details
Application Number
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Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-01 19:52
CPC Classifications
E; E21; E21C; E21C27/00; E21C27/20; E21C27/22
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