G: | SECTION G PHYSICS |
G09: | EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS |
G09F: | DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS |
G09F19/00: | Advertising or display means not otherwise provided for |
G09F19/02: | . incorporating moving display members |
G09F19/06: | . . Writing devices |