Patent for Stellwerk fuer Buehnenregulatoren, Schwabe & Co, 12/12/1921 (Q31801)
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Mechanical control system for stage dimmers
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Patent for Stellwerk fuer Buehnenregulatoren, Schwabe & Co, 12/12/1921 | Mechanical control system for stage dimmers |