178 / | HD | TELEGRAPHY |
118 | DF | RECEIVERS {4} |
89 | .~ Code recorders {8} | |
90 | DF | .~.~> Photographic |
91 | DF | .~.~> Siphon |
92 | DF | .~.~> Indenting or perforating |
93 | DF | .~.~> Polarized |
94 | DF | .~.~> Pyrographic |
95 | DF | .~.~> Stop mechanisms |
96 | DF | .~.~> Inking devices |
97 | DF | .~.~> Double-tape movement |