| G | SK | PHYSICS |
| G09 | KL | EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS |
| G09B | UKL | EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS |
| G09C | UKL | CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY |
| G09D | UKL | RAILWAY OR LIKE TIME OR FARE TABLES; PERPETUAL CALENDARS |
| G09F | UKL | DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS |
| G09G | UKL | ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F 3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F 9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H01L, H05B 33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N 1/00) [3, 4, 5] |