CPC Subgroup
G09F 19/12 using special optical effects
Full Title
Advertising or display means not otherwise provided for > using special optical effects
5 direct subcodes
Child Classifications
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- G09F 19/14 displaying different signs depending upon the view-point of the observer
- G09F 19/16 involving the use of mirrors
- G09F 19/18 involving the use of optical projection means, e.g. projection of images on clouds (projection apparatus per se G03B)
- G09F 19/20 with colour-mixing effects