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Publication of FR723518ApublicationCriticalpatent/FR723518A/fr
G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
G09F19/00—Advertising or display means not otherwise provided for
G09F19/12—Advertising or display means not otherwise provided for using special optical effects
G09F19/18—Advertising or display means not otherwise provided for using special optical effects involving the use of optical projection means, e.g. projection of images on clouds
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FR723518D1931-07-101931-10-01Appareil pour la projection de réclames et d'images de publicité
ExpiredFR723518A
(fr)