359 / | HD | OPTICS: SYSTEMS (INCLUDING COMMUNICATION) AND ELEMENTS |
109 | DF | OPTICAL COMMUNICATION {13} |
154 | DF | .~ Transmitter and receiver system {15} |
164 | .~.~ Plural stations {3} | |
165 | DF | .~.~.~> Address directing connections |
166 | DF | .~.~.~> Unidirectional or loopback |
167 | DF | .~.~.~> Central or master station |