Patent for a light projector by Herbert F King (Q31173)

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English
Patent for a light projector by Herbert F King
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    Type of information
    Field
    Internal image
    US1680685_Pagina_1.jpg
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    author
    Herbert F King
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    Publication date
    14 August 1928Gregorian
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    Copy available online
    mentions
    Canon Media Id
    1039
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