Difference between revisions of "Patent for a Buehnenscheinwerfer, Willy Hagedorn, 1921 (Q31872)"
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Revision as of 15:10, 12 March 2026
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
16 November 1921Gregorian
0 references