| 455 / | HD | TELECOMMUNICATIONS | 
| 899 | DF | MISCELLANEOUS {5} | 
| FOR 106 | DF | .~ Plural transmitters or receivers (i.e., more than two stations) (455/49.1) {4} | 
| FOR 113 | DF | .~.~ With central station (e.g., master, etc.) (455/53.1) {2} | 
| FOR 114 |  | .~.~.~ To or from mobile station (455/54.1) {3} | 
| FOR 115 | DF | .~.~.~.~> With service request and response (455/54.2) | 
| FOR 116 | DF | .~.~.~.~> Using radiating transmission line (455/55.1) | 
| FOR 117 | DF | .~.~.~.~> Multiple base stations (455/56.1) |