G09F 19/18
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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Edits on 5 Mar, 2022
Golden AI
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Description (+168 characters)
G09F 19/18
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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