improved Means for Lighting Theatrical Stages and other Area, Harald Dohrn (Q22952)

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improved Means for Lighting Theatrical Stages and other Area, Harald Dohrn
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    30 December 1915Gregorian
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    This patent is filed at the UK patent office and is mainly a combination of the patents filed earlier by Von Salzmann in Germany. Additionally the concept of the stairs is added. (English)
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