Patent FR669629A successfully refreshed from Google Patents.
FR669629A
Expired / Lapsed
FR
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Device for the suction of drilling dust produced by drilling work by means of a hollow drill bit
Assignee: Karl Brunzel
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Filing: 1929-02-14
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Granted: 1929-11-19
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Expires: 1949-02-14
Abstract
No abstract record available.
Inventors
- 👤 Karl Brunzel
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-05 04:18
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/16
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Total Claims: 0
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References Cited (Backward Citations)
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