Certificate for the United States Patent No. 2740892 awarded to Oskar Sala for a ‘synchronizing system for electrical musical instruments’ on April 3, 1956. · Musikinstrumente_en · DMD Omeka

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Certificate for the United States Patent No. 2740892 awarded to Oskar Sala for a ‘synchronizing system for electrical musical instruments’ on April 3, 1956.

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Title: Certificate for the United States Patent No. 2740892 awarded to Oskar Sala for a ‘synchronizing system for electrical musical instruments’ on April 3, 1956.
Rights Holder: Photo: Deutsches Museum, Archives, CD 62724; CC BY-SA 4.0