| 700 / | HD | DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS |
| 90 | DD | SPECIFIC APPLICATION, APPARATUS OR PROCESS {16} |
| 95 | DD | .~ Product assembly or manufacturing {7} |
| 117 | DD | .~.~ Particular manufactured product or operation {11} |
| 207 | DD | .~.~.~ Heating {4} |
| 209 | | .~.~.~.~ Furnace {1} |
| 210 | DD | .~.~.~.~.~> Multizone |