Patent for A system of circular electric rheostat with a plate and graduated resistance for special application to light distribution mechanisms in theaters. (Q31813)
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No description defined
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Patent for A system of circular electric rheostat with a plate and graduated resistance for special application to light distribution mechanisms in theaters. | No description defined |
Statements
16 September 1922Gregorian
0 references