Difference between revisions of "Process for achieving coloured light effects for stage purposes. Addition to patent 280509 Von Salzmann (Q22947)"
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Latest revision as of 10:42, 2 April 2025
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English | Process for achieving coloured light effects for stage purposes. Addition to patent 280509 Von Salzmann | No description defined |
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Publication date
24 October 1913Gregorian
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