Difference between revisions of "Patent for a Buehnenscheinwerfer, Willy Hagedorn, 1921 (Q31872)"
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Latest revision as of 10:42, 2 April 2025
a spotlight with a diafragm and mirror.
Language | Label | Description | Also known as |
---|---|---|---|
English | Patent for a Buehnenscheinwerfer, Willy Hagedorn, 1921 | a spotlight with a diafragm and mirror. |
Statements
Type of information
Field
Internal image
author
Publication date
16 November 1921Gregorian
0 references
Copy available online
mentions
Canon documents public id