Patent US3622080A successfully refreshed from Google Patents.
Patent DE472053C successfully refreshed from Google Patents.
DE472053C
Expired / Lapsed
DE
⏱️ 0.0 years remaining
Extension drill for deep boreholes
Assignee: WLODZIMIERZ LODZINSKI
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Filing: 1925-07-18
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Granted: 1929-02-28
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Expires: 1945-07-18
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
DE
Data Source
google_patents
Last Synchronized
2026-10-30 22:06
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/26; E21B10/265
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