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PCE
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CPC Subgroup
G09F 13/24

using tubes or the like filled with liquid, e.g. bubbling liquid

Full Title

Illuminated signs; Luminous advertising (G09F9/00, G09F11/00 take precedence; control of displays in general using static means to present variable information G09G) > using tubes or the like filled with liquid, e.g. bubbling liquid