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| Class Numbers & Titles | Class Numbers Only | USPC Index | International | HELP |
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Class 333 | WAVE TRANSMISSION LINES AND NETWORKS |
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| 1 | PLURAL CHANNEL SYSTEMS |
| 1.1 | Nonreciprocal gyromagnetic type (e.g., circulators) |
| 2 | With automatic control |
| 4 | With balanced circuits |
| 100 | Having branched circuits |
| 101 | Including switching means |
| 102 | Having gyromagnetic operating means |
| 103 | Having semiconductor operating means |
| 105 | Having mechanical switching means |
| 109 | Using directional coupler |
| 110 | For providing frequency separation |
| 111 | For providing adjustable coupling |
| 112 | Having lumped parameters or impedances |
| 113 | Having parallel-guide waveguide |
| 114 | Having crossed-guide waveguide |
| 115 | Having TEM lines |
| 117 | Including hybrid-type network |
| 118 | Having lumped parameters or impedances |
| 120 | Having hybrid ring junction |
| 121 | Having hybrid-T (e.g., magic-T) |
| 123 | Having coaxial element |
| 124 | With impedance matching |
| 125 | Including long line element |
| 129 | For providing frequency separation |
| 130 | Using resistors only |
| 131 | Using coupled windings |
| 132 | For providing frequency separation |
| 136 | Including long line element |
| 12 | TRANSMISSION LINE INDUCTIVE OR RADIATION INTERFERENCE REDUCTION SYSTEMS |
| 13 | RESONATOR-TYPE BREAKDOWN DISCHARGE SYSTEMS (E.G., T-R OR R-T SYSTEMS) |
| 14 | AMPLITUDE COMPRESSION AND EXPANSION SYSTEMS (I.E., COMPANDERS) |
| 15 | PILOT LINE-CONTROLLED SYSTEMS |
| 16 | PILOT CURRENT-CONTROLLED SYSTEMS |
| 17.1 | AUTOMATICALLY CONTROLLED SYSTEMS |
| 17.2 | Limiting of amplitude |
| 17.3 | Impedance matching |
| 18 | With control of equalizer and/or delay network |
| 19 | DIFFERENTIATING OR INTEGRATING SYSTEMS |
| 20 | WAVE-SHAPING |
| 21R | WAVE MODE CONVERTERS |
| 22R | DISSIPATING TERMINATIONS FOR LONG LINES |
| 23 | ARTIFICIAL LINES |
| 24R | COUPLING NETWORKS |
| 24.1 | Nonreciprocal gyromagnetic type (e.g., directional phase shifters) |
| 25 | Balanced to unbalanced circuits |
| 27 | Interlinking long line |
| 28R | Equalizers |
| 138 | Delay lines including a lumped parameter |
| 141 | Delay lines including elastic bulk wave propagation means |
| 142 | Multipath propagation |
| 144 | Variable delay |
| 145 | Nonuniform propagation path |
| 146 | Helical propagation path |
| 147 | Propagation path has significant chemical or physical properties |
| 148 | Including magnetostrictive transducers |
| 149 | Significant transducer structure |
| 150 | Delay lines including elastic surface wave propagation means |
| 151 | Spurious signal or mode cancellation means |
| 152 | Variable delay |
| 153 | Including discontinuities within propagation means |
| 154 | Significant transmitting or receiving transducer structure |
| 155 | Temperature stabilization or compensation |
| 156 | Delay lines including long line elements |
| 157 | Waveguide |
| 160 | Coaxial line |
| 161 | Planar line structure (e.g., stripline) |
| 162 | Helical line structures and lines developed from a helical structure |
| 164 | Control of delay with semiconductive means |
| 32 | With impedance matching |
| 165 | Frequency or time domain filters and delay lines utilizing charge transfer devices |
| 166 | Time domain filters |
| 167 | Frequency domain filters utilizing only lumped parameters |