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FR875974A
Expired / Lapsed
FR
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Observation apparatus for positives and negatives of photographs or x-rays
Assignee: Friedrich Richard Dietrich
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Filing: 1941-10-14
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Granted: 1942-10-09
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Expires: 1961-10-14
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Richard Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-05 17:52
CPC Classifications
G; G02; G02B; G02B30/00; G02B30/40
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